Dynastic Marriage
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Royal intermarriage is the practice of members of ruling
dynasties A dynasty is a sequence of rulers from the same family, usually in the context of a monarchical system, but sometimes also appearing in republics. A dynasty may also be referred to as a "house", "family" or "clan", among others. Historians ...
marrying into other reigning families. It was more commonly done in the past as part of strategic diplomacy for
national interest The national interest is a sovereign state's goals and ambitions – be they economic, military, cultural, or otherwise – taken to be the aim of its government. Etymology The Italian phrase ''ragione degli stati'' was first used by Giovanni de ...
. Although sometimes enforced by legal requirement on persons of royal birth, more often it has been a matter of political policy or tradition in monarchies. In Europe, the practice was most prevalent from the
medieval era In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and t ...
until the outbreak of
World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
, but evidence of intermarriage between royal dynasties in other parts of the world can be found as far back as the
Bronze Age The Bronze Age () was a historical period characterised principally by the use of bronze tools and the development of complex urban societies, as well as the adoption of writing in some areas. The Bronze Age is the middle principal period of ...
. Monarchs were often in pursuit of national and international aggrandisement on behalf of themselves and their dynasties, thus bonds of kinship tended to promote or restrain aggression.Bucholz, p.228 Marriage between dynasties could serve to initiate, reinforce or guarantee peace between nations. Alternatively, kinship by marriage could secure an alliance between two dynasties which sought to reduce the sense of threat from or to initiate aggression against the realm of a third dynasty. It could also enhance the prospect of territorial acquisition for a dynasty by procuring legal claim to a foreign throne, or portions of its realm (e.g., colonies), through inheritance from an heiress whenever a monarch failed to leave an undisputed male heir. In parts of Europe, royalty continued to regularly marry into the families of their greatest
vassal A vassal or liege subject is a person regarded as having a mutual obligation to a lord or monarch, in the context of the feudal system in medieval Europe. While the subordinate party is called a vassal, the dominant party is called a suzerain ...
s as late as the 16th century. More recently, they have tended to marry internationally. In other parts of the world royal intermarriage was less prevalent and the number of instances varied over time, depending on the culture and foreign policy of the era.


By continent/country

While the contemporary Western ideal sees marriage as a unique bond between two people who are in love, families in which heredity is central to power or inheritance (such as royal families) have often seen marriage in a different light. There are often political or other non-romantic functions that must be served and the relative wealth and power of the potential spouses may be considered. Marriage for political, economic, or diplomatic reasons, the
marriage of state A marriage of state is a diplomatic marriage or union between two members of different nation-states or internally, between two power blocs, usually in authoritarian societies and is a practice which dates back to ancient times, as far back as ear ...
, was a pattern seen for centuries among European rulers.Fleming


Africa

At times, marriage between members of the same dynasty has been common in Central Africa. In West Africa, the sons and daughters of Yoruba kings were traditionally given in marriage to their fellow royals as a matter of dynastic policy. Sometimes these marriages would involve members of other tribes. Erinwinde of Benin, for example, was taken as a wife by the '' Oba'' Ọranyan of Oyo during his time as governor of Benin. Their son Eweka went on to found the dynasty that rules the
Kingdom of Benin The Kingdom of Benin, also known as Great Benin, is a traditional kingdom in southern Nigeria. It has no historical relation to the modern republic of Benin, which was known as Dahomey from the 17th century until 1975. The Kingdom of Benin's c ...
. Marriages between the Swazi, Zulu and Thembu royal houses of southern Africa are common. For example, the daughter of South African president and Thembu royal
Nelson Mandela Nelson Rolihlahla Mandela ( , ; born Rolihlahla Mandela; 18 July 1918 – 5 December 2013) was a South African Internal resistance to apartheid, anti-apartheid activist and politician who served as the first president of South Africa f ...
, Zenani Mandela, married Prince Thumbumuzi Dlamini, a brother of
Mswati III Mswati III (born Makhosetive Dlamini; 19 April 1968) is the ''Ngwenyama'' (King) of Eswatini and head of the Swazi royal family. He heads an absolute monarchy, as he has veto power over all branches of government and is constitutionally immune fr ...
, King of Eswatini. Elsewhere in the region, Princess Semane Khama of the Bamangwato tribe of
Botswana Botswana, officially the Republic of Botswana, is a landlocked country in Southern Africa. Botswana is topographically flat, with approximately 70 percent of its territory part of the Kalahari Desert. It is bordered by South Africa to the sou ...
married ''
Kgosi A (; ) is the title for a hereditary leader of a Batswana and South Africa peoples tribe. Usage The word "kgosi" is a Setswana term for "king" or "chief". Various affixes can be added to the word to change its meaning: adding the prefix ''di- ...
'' Lebone Edward Molotlegi of the Bafokeng tribe of South Africa. Other examples of historical,
mythical Myth is a genre of folklore consisting primarily of narratives that play a fundamental role in a society. For scholars, this is very different from the vernacular usage of the term "myth" that refers to a belief that is not true. Instead, the ...
and contemporary royal intermarriages throughout Africa include: * Princess Mantfombi Dlamini, sister of Mswati III of Eswatini, and Goodwill Zwelithini, King of the Zulus, as his chief queen consort * Maxhob'ayakhawuleza Sandile, King of Rharhabe Xhosas, and Noloyiso Sandile, the daughter of King Cyprian Bhekuzulu of the Zulus. * The Toucouleur emperor Umar Tall and Princess Maryem, the daughter of Sultan
Muhammed Bello Muhammadu Bello (; ; 3 November 1781 – 25 October 1837) was the second Caliph of Sokoto and reigned from 1817 until 1837. He was also an active writer of history, poetry, and Islamic studies. He was the son and primary aide to Usman dan Fodio ...
of
Sokoto Sokoto (Hausa language, Hausa: ; Fulfulde, Fula: , ''Leydi Sokoto'') is one of the 36 states of Nigeria, located in the extreme northwest of the country. It is bounded by Niger, Republic of the Niger to the north and west for 363 km (226 m ...
* Chief Nfundu Bolulengwe Mtirara of the
Thembu people The Thembu () are a Xhosa Nation who inhabited the Kingdom of Thembuland. They were established around the 16th century as one of the Xhosa federations in the Transkeian territories. The federation was later annexed by British Empire shortly ...
, a great-nephew of
Nelson Mandela Nelson Rolihlahla Mandela ( , ; born Rolihlahla Mandela; 18 July 1918 – 5 December 2013) was a South African Internal resistance to apartheid, anti-apartheid activist and politician who served as the first president of South Africa f ...
, and Princess Nandi of Zululand, a granddaughter of King Goodwill Zwelithini. * Fadlallah, son of ''Shehu''
Rabih az-Zubayr Rabih az-Zubayr ibn Fadl Allah (; c. 1842 – April 22, 1900), also known as Rabih Fadlallah and usually known as Rabah in French, was a Sudanese warlord and slave trader who established a powerful empire east of Lake Chad, in today's Chad. B ...
of Borno, and Khadija, a daughter of Sheik Mohammed al-Mahdi al-Sanusi of the Senoussi people. * Princess Owawejokun, a daughter of the ''Owa'' Atakumosa of Ijeshaland, and Ogoro, the ''Ajapada'' of
Akure Akure is a city in south-western Nigeria. It is the Capital city, capital and largest city of Ondo State. The city had a population of 403,000 as of the 2006 population census. Its current population is estimated at 774,000.Alaafin'' of Oyo, and Torosi, a princess of the Nupe people.


Ancient Egypt

Several Egyptian pharaohs married the daughters of neighbouring kings to secure peace and form alliances. The Egyptian-Hittite peace treaty, the earliest known surviving peace treaty in the world, was sealed by a marriage between the pharaoh
Ramesses II Ramesses II (sometimes written Ramses or Rameses) (; , , ; ), commonly known as Ramesses the Great, was an Pharaoh, Egyptian pharaoh. He was the third ruler of the Nineteenth Dynasty of Egypt, Nineteenth Dynasty. Along with Thutmose III of th ...
and a Hittite princess. Pharaoh
Amasis II Amasis II ( ; ''ḤMS'') or Ahmose II was a pharaoh (reigned 570526 BCE) of the Twenty-sixth Dynasty of Egypt, the successor of Apries at Sais, Egypt, Sais. He was the last great ruler of Ancient Egypt, Egypt before the Achaemenid Empire, Persian ...
married a Greek princess named Ladice daughter of King Battus III of Cyrene. Not to mention the
Ptolemaic Kingdom The Ptolemaic Kingdom (; , ) or Ptolemaic Empire was an ancient Greek polity based in Ancient Egypt, Egypt during the Hellenistic period. It was founded in 305 BC by the Ancient Macedonians, Macedonian Greek general Ptolemy I Soter, a Diadochi, ...
, the last (and longest) dynasty to rule all of Egypt before its incorporation into the Roman Republic, who were infamous for their inbreeding in the form of sibling marriages. This was to keep their bloodline pure, and to prevent external forces from potentially taking power through a connection to the royal line. However, Pharaoh
Amenhotep III Amenhotep III ( , ; "Amun is satisfied"), also known as Amenhotep the Magnificent or Amenhotep the Great and Hellenization, Hellenized as Amenophis III, was the ninth pharaoh of the Eighteenth Dynasty of Egypt, Eighteenth Dynasty. According to d ...
alone is known to have married several foreign women: Gilukhepa, daughter of Shuttarna II of
Mitanni Mitanni (–1260 BC), earlier called Ḫabigalbat in old Babylonian texts, ; Hanigalbat or Hani-Rabbat in Assyrian records, or in Ancient Egypt, Egyptian texts, was a Hurrian language, Hurrian-speaking state in northern Syria (region), Syria an ...
, in the tenth year of his reign; Tadukhepa, daughter of his ally Tushratta of Mitanni, around Year 36 of his reign; a daughter of Kurigalzu I of
Babylon Babylon ( ) was an ancient city located on the lower Euphrates river in southern Mesopotamia, within modern-day Hillah, Iraq, about south of modern-day Baghdad. Babylon functioned as the main cultural and political centre of the Akkadian-s ...
; a daughter of Kadashman-Enlil I of Babylon; a daughter of Tarhundaradu of
Arzawa Arzawa was a region and political entity in Western Anatolia during the Late Bronze Age. In Hittite texts, the term is used to refer both to a particular kingdom and to a loose confederation of states. The chief Arzawan state, whose capital wa ...
; and a daughter of the ruler of Ammia (in modern Syria).


Asia


Babylonia and Assyria

There are a few recorded cases of intermarriage between Assyrian and Babylonian royals. According to legend, the Babylonian
Semiramis Semiramis (; ''Šammīrām'', ''Šamiram'', , ''Samīrāmīs'') was the legendary Lydian- Babylonian wife of Onnes and of Ninus, who succeeded the latter on the throne of Assyria, according to Movses Khorenatsi. Legends narrated by Diodorus ...
was married to the Assyrian general Onnes and then to the Assyrian king
Ninus Ninus (), according to Greek historians writing in the Hellenistic period and later, was the founder of Nineveh (also called Νίνου πόλις "city of Ninus" in Greek), ancient capital of Assyria. The figure or figures with which he correspon ...
, the legendary founder of
Nineveh Nineveh ( ; , ''URUNI.NU.A, Ninua''; , ''Nīnəwē''; , ''Nīnawā''; , ''Nīnwē''), was an ancient Assyrian city of Upper Mesopotamia, located in the modern-day city of Mosul (itself built out of the Assyrian town of Mepsila) in northern ...
according to the Ancient Greeks. She has been equated with the historical Shammuramat, wife of Shamshi-Adad V. In turn, Shammuramat has been claimed to be of Babylonian descent. In the early 9th century BC, the Babylonian king Nabu-shuma-ukin I ('' Dynasty of E'') exchanged daughters in marriage with the contemporary Assyrian monarch. The Assyrian princess Muballitat-Sherua, daughter of Ashur-uballit I, was given in marriage to the contemporary Babylonian monarch. She was the mother of the future Babylonian king Kara-hardash. Additionally, Kurigalzu II was either the son or grandson of Muballitat. Other consorts of Assyrian monarchs, such as Naqiʾa, Ešarra-ḫammat, Banitu (who was perhaps brought to Assyria as a hostage after Tiglath-Pileser's conquest of Babylon) might also have been of Babylonian origin.


Babylon and Elam

Babylonians and Elamites engaged many times in royal intermarriage, especially in the Kassite period. It is probable that Elamites and Kassites had close ties long before the first attested royal intermarriages between them. Babylonian Kassites and Elamites intensively intermarried for a period of about 120 years, from c. 1290 to 1170 BC. The royal intermarriages in this period were: Pahir-ishshan to eldest daughter (princess) of Kurigalzu II (1290);
Untash-Napirisha Untash-Napirisha was king of Elam (in present-day southwest Iran) during the Middle Elamite period, circa 1300 BCE. He was the son of the previous Elamite king, Humban-Numena and of a daughter (or granddaughter) of Kurigalzu. He was named afte ...
to daughter of prince Burnaburiash (1250); Kidin-Hutran to daughter of prince ..duniash (1230); Shutruk-Nakhunte to the eldest daughter of Melishihu. Also Napirisha-Untash (c. 1210 BC) and Hutelutush-Inshushinak (c. 1190) are thought to have married Babylonian Kassite princesses. A man of Elamite origin,
Mar-biti-apla-usur Mār-bīti-apla-uṣur, inscribed DUMU-É-A-PAB on contemporary inscriptions on Lorestān bronze arrowheads or dA-É-AxA-ŠEŠ in the '' Dynastic Chronicle'', means “O Marbīti, protect the heir.” Marbīti was a deity associated with Dēr ...
, the founder of the so-called
Elamite dynasty The Elamite dynasty, also known as the seventh Babylonian dynasty, was a short-lived dynasty of Elamite origin who ruled from the city of Babylon in the early 10th century BC. The dynasty's first and only ruler was Mar-biti-apla-usur. History ...
, reigned in Babylon from around 980 to 975 BC, though the identity and origin of his consort are unknown. He might not have been himself from Elam but a Babylonian partially of Elamite origin.


Thailand

The
Chakri dynasty The Chakri dynasty is the current reigning dynasty of the Thailand, Kingdom of Thailand. The head of the house is the Monarchy of Thailand, king, who is head of state. The family has ruled Thailand since the founding of the Rattanakosin era and ...
of
Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...
has included marriages between royal relatives, but marriages between dynasties and foreigners, including foreign royals, are rare. This is in part due to Section 11 of 1924 Palace Law of Succession which excludes members of the royal family from the line of succession if they marry a non-Thai national. The late king
Bhumibol Adulyadej Bhumibol Adulyadej (5 December 192713 October 2016), titled Rama IX, was King of Thailand from 1946 until Death and funeral of Bhumibol Adulyadej, his death in 2016. His reign of 70 years and 126 days is the longest of any List of Thai mo ...
was a first-cousin once removed of his wife,
Sirikit Sirikit (born ''Mom Rajawongse'' Sirikit Kitiyakara; 12 August 1932) is a member of the Thai royal family who was List of Thai royal consorts#Rattanakosin Kingdom, Queen of Thailand from 28 April 1950 to 13 October 2016 as the wife of King Bhum ...
, the two being, respectively, a grandson and a great-granddaughter of
Chulalongkorn Chulalongkorn (20 September 1853 – 23 October 1910), posthumously honoured as King Chulalongkorn the Great, was the fifth king of Siam from the Chakri dynasty, titled Rama V. Chulalongkorn's reign from 1868 until his death in 1910 was cha ...
. Chulalongkorn married a number of his half-sisters, including
Savang Vadhana Sri Savarindira (; , 10 September 1862 – 17 December 1955), also known as Savang Vadhana (; ). She was a half-sister and queen of King Chulalongkorn (Rama V). After her first grandson's accession to power in 1935, she became known as Her Ma ...
and Sunandha Kumariratana; all shared the same father,
Mongkut Mongkut (18 October 18041 October 1868) was the fourth Monarchy of Thailand, king of Siam from the Chakri dynasty, titled Rama IV. He reigned from 1851 until his death in 1868. The reign of Mongkut was marked by significant modernization ini ...
. He also married Dara Rasmi, a princess of a vassal state.


Vietnam

The
Lý dynasty The Lý dynasty (, , chữ Nôm: 茹李, chữ Hán: 朝李, Vietnamese language, Vietnamese: ''triều Lý''), officially Đại Cồ Việt (chữ Hán: 大瞿越) from 1009 to 1054 and Đại Việt (chữ Hán: 大越) from 1054 to 1225, was ...
which ruled
Dai Viet Dai may refer to: Names * Dai (given name), a Welsh or Japanese masculine given name * Dai (surname) (戴), a Chinese surname * Bảo Đại (保大), Emperor of Vietnam from 1926 to 1945 Places and regimes * Dai Commandery, a commandery of ...
(Vietnam) married its princesses off to regional rivals to establish alliances with them. One of these marriages was between a Lý empress regnant ( Lý Chiêu Hoàng) and a member of fishermen-turned-warlords Trần clan (
Trần Thái Tông Trần Thái Tông (17 July 1218 – 5 May 1277), Vietnamese name, personal name Trần Cảnh or Trần Nhật Cảnh, temple name Thái Tông, was the first emperor of the Trần dynasty, reigned Đại Việt for 33 years (1226–58), being R ...
) from
Nam Định Nam Định () is the capital city of Nam Định province in the Red River Delta of the Northern Vietnam. History From August 18–20 of each year, there is a festival held in Nam Định called the Cố Trạch. This celebration honors Gener ...
, which enabled the Trần to then topple the Lý and established their own
Trần dynasty The Trần dynasty (Vietnamese language, Vietnamese: Nhà Trần, chữ Nôm: 茹陳; Vietnamese language, Vietnamese: triều Trần, chữ Hán: ikt:朝ikt:陳, 朝wikt:陳, 陳), officially Đại Việt (Chữ Hán: 大越), was a List ...
. A Lý princess also married into the Hồ clan faction, which later usurped power and established the
Hồ dynasty The Hồ dynasty (Vietnamese: , chữ Nôm: 茹胡; Vietnamese: ''triều'' ''Hồ'', chữ Hán: wikt:朝, 朝wikt:胡, 胡), officially Đại Ngu (; chữ Hán: 大虞), was a short-lived List of Vietnamese dynasties, Vietnamese dynasty cons ...
after having a Tran princess marry their leader,
Hồ Quý Ly Hồ Quý Ly ( vi-hantu, 胡季犛, 1336 – 1407?) ruled Đại Ngu (Vietnam) from 1400 to 1401 as the founding emperor of the short-lived Hồ dynasty. Quý Ly rose from a post as an official served the court of the ruling Trần dynasty and ...
.


Cambodia

The Cambodian King Chey Chettha II married the Vietnamese Nguyễn lord Princess Nguyễn Thị Ngọc Vạn, a daughter of Lord Nguyễn Phúc Nguyên, in 1618. In return, the king granted the Vietnamese the right to establish settlements in Mô Xoài (now
Bà Rịa Bà Rịa () is a city in Bà Rịa–Vũng Tàu province in the Southeast region of Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of ab ...
), in the region of Prey Nokor—which they colloquially referred to as ''Sài Gòn'', and which later became
Ho Chi Minh City Ho Chi Minh City (HCMC) ('','' TP.HCM; ), commonly known as Saigon (; ), is the most populous city in Vietnam with a population of around 14 million in 2025. The city's geography is defined by rivers and canals, of which the largest is Saigo ...
.


India

In the
Chola dynasty The Chola dynasty () was a Tamil dynasty originating from Southern India. At its height, it ruled over the Chola Empire, an expansive maritime empire. The earliest datable references to the Chola are from inscriptions dated to the 3rd cen ...
in southern India, Madhurantaki the daughter of Emperor Rajendra II married
Kulottunga I Kulottunga Chola I ('; Middle Tamil: Kulōttuṅka Cōḻaṉ; Classical Sanskrit: Kulottuṅgā Cōḷa; 1025–1122) also spelt Kulothunga (), born Rajendra Chalukya (Telugu language, Telugu: Rājēndra Cāḷukyuḍu), was a Chola empire, C ...
the son the son of Eastern Chalukya ruler Rajaraja Narendra. This was to improve the relationship between the two royal houses and to straighten Chola influence in Vengai. Kulottunga and Madhurantaki were first cousins as Kulottunga's mother Amangai Devi was the sister of Rajendra II making them both the grandchildren of Emperor Rajendra I.


China

Marriage policy in imperial China differed from dynasty to dynasty. Several dynasties practiced
Heqin ''Heqin'', also known as marriage alliance, refers to the historical practice of Chinese monarchs marrying princesses—usually members of minor branches of the ruling family—to rulers of neighboring states. It was often adopted as an appeasem ...
, which involved marrying off princesses to other royal families. The Xiongnu practiced marriage alliances with Han dynasty officers and officials who defected to their side. The older sister of the Chanyu (the Xiongnu ruler) was married to the Xiongnu general Zhao Xin, the Marquis of Xi who was serving the Han dynasty. The daughter of the Chanyu was married to the Han Chinese general Li Ling after he surrendered and defected. The Yenisei Kirghiz Khagans claimed descent from Li Ling. Another Han Chinese general who defected to the Xiongnu was Li Guangli who also married a daughter of the Chanyu. The
Xianbei The Xianbei (; ) were an ancient nomadic people that once resided in the eastern Eurasian steppes in what is today Mongolia, Inner Mongolia, and Northeastern China. The Xianbei were likely not of a single ethnicity, but rather a multiling ...
Tuoba The Tuoba (Chinese language, Chinese) or Tabgatch (, ''Tabγač''), also known by #Names, other names, was an influential Xianbei clan in early imperial China. During the Sixteen Kingdoms after the fall of Han and the Three Kingdoms, the Tuoba e ...
royal family of
Northern Wei Wei (), known in historiography as the Northern Wei ( zh, c=北魏, p=Běi Wèi), Tuoba Wei ( zh, c=拓跋魏, p=Tuòbá Wèi), Yuan Wei ( zh, c=元魏, p=Yuán Wèi) and Later Wei ( zh, t=後魏, p=Hòu Wèi), was an Dynasties of China, impe ...
started to arrange for Han Chinese elites to marry daughters of the royal family in the 480s. Some Han Chinese exiled royalty fled from southern China and defected to the Xianbei. Several daughters of the Xianbei
Emperor Xiaowen of Northern Wei Emperor Xiaowen of Northern Wei ((北)魏孝文帝) (October 13, 467 – April 26, 499), personal name Tuoba Hong (拓拔宏), later Yuan Hong (元宏), was an emperor of China's Northern Wei dynasty, reigning from September 20, 471 to April 26, ...
were married to Han Chinese elites, the Han Chinese
Liu Song Song, known as Liu Song (), Former Song (前宋) or Song of (the) Southern dynasties (南朝宋) in historiography, was an Dynasties of China, imperial dynasty of China and the first of the four Northern and Southern dynasties#Southern dynasti ...
royal Liu Hui 劉輝, married Princess Lanling 蘭陵公主 of the Northern Wei,. Princess Huayang 華陽公主 to Sima Fei 司馬朏, a descendant of Jin dynasty royalty, Princess Jinan 濟南公主 to Lu Daoqian 盧道虔, Princess Nanyang 南陽長公主 to Xiao Baoyin 蕭寶夤, a member of
Southern Qi Qi, known in historiography as the Southern Qi ( or ) or Xiao Qi (), was a Chinese imperial dynasty and the second of the four Southern dynasties during the Northern and Southern dynasties era. It followed the Liu Song dynasty and was succee ...
royalty. Emperor Xiaozhuang of Northern Wei's sister the Shouyang Princess was wedded to The
Liang dynasty The Liang dynasty (), alternatively known as the Southern Liang () or Xiao Liang () in historiography, was an imperial dynasty of China and the third of the four Southern dynasties during the Northern and Southern dynasties period. It was pre ...
ruler
Emperor Wu of Liang Emperor Wu of Liang () (464 – 12 June 549), personal name Xiao Yan (蕭衍), courtesy name Shuda (叔達), childhood name Lian'er (練兒), was the founding Emperor of China, emperor of the Chinese Liang dynasty, during the Northern and Souther ...
's son Xiao Zong 蕭綜. When the Eastern Jin dynasty ended Northern Wei received the Jin prince Sima Chuzhi 司馬楚之 as a refugee. A Northern Wei Princess married Sima Chuzhi, giving birth to Sima Jinlong.
Northern Liang The Northern Liang (; 397–439) was a Dynasties in Chinese history, dynastic state of China and one of the Sixteen Kingdoms in Chinese history. It was ruled by the Juqu (沮渠) family of Lushuihu ethnicity, though they are sometimes categorized ...
King Juqu Mujian's daughter married Sima Jinlong. The
Rouran Khaganate The Rouran Khaganate ( Chinese: zh, c=, p=Róurán, label=no), also known as Ruanruan or Juan-juan ( zh, c=, p=Ruǎnruǎn, label=no) (or variously ''Jou-jan'', ''Ruruan'', ''Ju-juan'', ''Ruru'', ''Ruirui'', ''Rouru'', ''Rouruan'' or ''Tantan'') ...
arranged for one of their princesses, Khagan
Yujiulü Anagui Yujiulü Anagui (Rouran: ''Ańakay''; ; pinyin: Yùjiǔlǘ Ānàguī) (?–552) was ruler of the Rouran (520–552) with the title of Chiliantouqiudoufa Khagan (敕連頭丘豆伐可汗; Rouran: ''Tengridü Kötölber Qaγan''). First reign His r ...
's daughter Princess Ruru 蠕蠕公主 to be married to the Han Chinese ruler Gao Huan of the
Eastern Wei Wei (), known in historiography as the Eastern Wei (), was an Dynasties in Chinese history, imperial dynasty of China that followed the disintegration of the Northern Wei dynasty. One of the Northern and Southern dynasties#Northern dynasties, Nor ...
. The Kingdom of Gaochang was made out of Han Chinese colonists and ruled by the Han Chinese Qu family which originated from Gansu. Jincheng commandery 金城 (Lanzhou), district of Yuzhong 榆中 was the home of the Qu Jia. The Qu family was linked by marriage alliances to the Turks, with a Turk being the grandmother of King Qu Boya.
Tang dynasty The Tang dynasty (, ; zh, c=唐朝), or the Tang Empire, was an Dynasties of China, imperial dynasty of China that ruled from 618 to 907, with an Wu Zhou, interregnum between 690 and 705. It was preceded by the Sui dynasty and followed ...
(618–907) emperors exchanged and the rulers of the Uyghur Khaganate exchanged princesses in marriage to consolidate the special trade and military relationship that developed after the Khaganate supported the Chinese during the An Lushan Rebellion.Veit, p.57 The Uyghur Khaganate exchanged princesses in marriage with Tang dynasty China in 756 to seal the alliance against An Lushan. The Uyghur Khagan Bayanchur Khan had his daughter Uyghur Princess Pijia (毗伽公主) married to Chinese prince Li Chengcai ( 李承采) of the Tang dynasty, Prince of Dunhuang (敦煌王), son of Li Shouli, Prince of Bin, while Chinese princess Ninguo of the Tang dynasty married Uyghur Khagan Bayanchur. At least three Tang imperial princesses are known to have married
khagan Khagan or Qaghan (Middle Mongol:; or ''Khagan''; ) or zh, c=大汗, p=Dàhán; ''Khāqān'', alternatively spelled Kağan, Kagan, Khaghan, Kaghan, Khakan, Khakhan, Khaqan, Xagahn, Qaghan, Chagan, Қан, or Kha'an is a title of empire, im ...
s between 758 and 821. These unions temporarily stopped in 788, partly because stability within China meant that they were politically unnecessary. However, threats from
Tibet Tibet (; ''Böd''; ), or Greater Tibet, is a region in the western part of East Asia, covering much of the Tibetan Plateau and spanning about . It is the homeland of the Tibetan people. Also resident on the plateau are other ethnic groups s ...
in the west, and a renewed need for Uyghur support, precipitated the marriage of
Princess Taihe Princess Taihe (太和公主, personal name unknown), later, in 843, known as Princess Ding'an (定安公主) or Princess Anding (安定公主), was a princess of the Chinese Tang dynasty and a khatun (empress) of the Uyghur Khaganate. She was ma ...
to
Bilge Khagan Bilge Qaghan (; ; 683 – 25 November 734) was the fourth khagan, Qaghan of the Second Turkic Khaganate. His accomplishments were described in the Orkhon inscriptions. Names As was the custom, his personal name and the name after assuming the t ...
. The ethnically Chinese Cao family ruling Guiyi Circuit established marriage alliances with the Uighurs of the Ganzhou Kingdom, with both the Cao rulers marrying Uighur princesses and with Cao princesses marrying Uighur rulers. The Ganzhou Uighur Khagan's daughter was married to Cao Yijin in 916. The Chinese Cao family ruling Guiyi Circuit established marriage alliances with the Saka
Kingdom of Khotan The Kingdom of Khotan was an ancient Buddhism, Buddhist Saka kingdom located on the branch of the Silk Road that ran along the southern edge of the Taklamakan Desert in the Tarim Basin (modern-day Xinjiang, China). The ancient capital was origina ...
, with both the Cao rulers marrying Khotanese princesses and with Cao princesses marrying Khotanese rulers. A Khotanese princess who was the daughter of the King of Khotan married Cao Yanlu. The Khitan Liao dynasty arranged for women from the Khitan royal consort Xiao clan to marry members of the Han Chinese Han 韓 clan, which originated in Jizhou 冀州 before being abducted by the Khitan and becoming part of the Han Chinese elite of the Liao. Han Chinese Geng family intermarried with the Khitan and the Han 韓 clan provided two of their women as wives to Geng Yanyi and the second one was the mother of Geng Zhixin. Empress Rende's sister, a member of the Xiao clan, was the mother of Han Chinese General Geng Yanyi. Han Durang (Yelu Longyun) was the father of Queen dowager of State Chen, who was the wife of General Geng Yanyi and buried with him in his tomb in Zhaoyang in Liaoning. His wife was also known as "Madame Han". The Geng's tomb is located in Liaoning at Guyingzi in Chaoying. Emperors of the proceeding
Song dynasty The Song dynasty ( ) was an Dynasties of China, imperial dynasty of China that ruled from 960 to 1279. The dynasty was founded by Emperor Taizu of Song, who usurped the throne of the Later Zhou dynasty and went on to conquer the rest of the Fiv ...
(960–1279) tended to marry from within their own borders. Tang emperors, mainly took their wives from high-ranking bureaucratic families, but the Song dynasty did not consider rank important when it came to selecting their consorts.Zhao, p.34 It has been estimated that only a quarter of Song consorts were from such families, with the rest being from lower status backgrounds. For example, Liu, consort of Emperor Zhenzong, had been a street performer and consort Miao, wife of Emperor Renzong was the daughter of his own
wet nurse A wet nurse is a woman who breastfeeding, breastfeeds and cares for another's child. Wet nurses are employed if the mother dies, if she is unable to nurse the child herself sufficiently or chooses not to do so. Wet-nursed children may be known a ...
. During the
Qing dynasty The Qing dynasty ( ), officially the Great Qing, was a Manchu-led Dynasties of China, imperial dynasty of China and an early modern empire in East Asia. The last imperial dynasty in Chinese history, the Qing dynasty was preceded by the ...
(1644–1912), emperors chose their consorts primarily from one of the eight Banner families, administrative divisions that divide all native Manchu families. To maintain the ethnic purity of the ruling dynasty, after the Kangxi Period (1662–1722), emperors and princes were forbidden to marry non-Manchu and non-Mongol wives.Walthall, p.149 Imperial daughters however were not covered by this ban, and as with their preceding dynasties, were often married to Mongol princes to gain political or military support, especially in the early years of the Qing dynasty; three of the nine daughters of Emperor
Nurhaci Nurhaci (14 May 1559 – 30 September 1626), also known by his temple name as the Emperor Taizu of Qing, was the founding khan of the Jurchen people, Jurchen-led Later Jin (1616–1636), Later Jin dynasty. As the leader of the House of Aisin-Gi ...
and twelve of Emperor Hongtaiji's daughters were married to Mongol princes. The
Manchu The Manchus (; ) are a Tungusic peoples, Tungusic East Asian people, East Asian ethnic group native to Manchuria in Northeast Asia. They are an officially recognized Ethnic minorities in China, ethnic minority in China and the people from wh ...
imperial
Aisin Gioro The House of Aisin-Gioro is a Manchu clan that ruled the Later Jin dynasty (1616–1636), the Qing dynasty (1636–1912), and Manchukuo (1932–1945) in the history of China. Under the Ming dynasty, members of the Aisin Gioro clan served as chie ...
clan practiced marriage alliances with Han Chinese Ming generals and Mongol princes. Aisin Gioro women were married to Han Chinese generals who defected to the Manchu side during the
Manchu conquest of China The transition from Ming to Qing (or simply the Ming-Qing transition) or the Manchu conquest of China from 1618 to 1683 saw the transition between two major Dynasties in Chinese history, dynasties in Chinese history. It was a decades-long conf ...
. The Manchu leader
Nurhaci Nurhaci (14 May 1559 – 30 September 1626), also known by his temple name as the Emperor Taizu of Qing, was the founding khan of the Jurchen people, Jurchen-led Later Jin (1616–1636), Later Jin dynasty. As the leader of the House of Aisin-Gi ...
married one of his granddaughters to the Ming general
Li Yongfang Li Yongfang (; died 1634) was a Chinese general of the Ming dynasty and Qing dynasty known for defecting to the Qing dynasty, due to the Ming dynasty losing the city of Fushun in Liaoning to the Qing. Li Yongfang along with many other Han Chinese d ...
( 李永芳) after he surrendered
Fushun Fushun ( zh, s=, t=, p=Fǔshùn, historically Fuxi ()) is a prefecture level city in Liaoning province, China, about east of Shenyang, with a total area of , of which is the city proper. Situated on the Hun River ("muddy river"), it is one o ...
in
Liaoning ) , image_skyline = , image_alt = , image_caption = Clockwise: Mukden Palace in Shenyang, Xinghai Square in Dalian, Dalian coast, Yalu River at Dandong , image_map = Liaoning in China (+all claims hatched).svg , ...
to the Manchu in 1618 and a mass marriage of Han Chinese officers and officials to Manchu women numbering 1,000 couples was arranged by Prince Yoto 岳托 ( Prince Keqin) and Hongtaiji in 1632 to promote harmony between the two ethnic groups. Aisin Gioro women were married to the sons of the Han Chinese generals Sun Sike (Sun Ssu-k'o) 孫思克, Geng Jimao (Keng Chi-mao), Shang Kexi (Shang K'o-hsi), and
Wu Sangui Wu Sangui (; 8 June 1612 – 2 October 1678), courtesy name Changbai () or Changbo (), was a Chinese military leader who played a key role in the fall of the Ming dynasty and the founding of the Qing dynasty. In Chinese folklore, Wu Sangui is r ...
(Wu San-kuei). Nurhaci's son Abatai's daughter was married to Li Yongfang. The offspring of Li received the "Third Class Viscount" () title. Li Yongfang was the great-great-great-grandfather of Li Shiyao 李侍堯. The "efu" 額駙 rank was given to husbands of Qing princesses. Geng Zhongming, a Han bannerman, was awarded the title of Prince Jingnan, and his son Geng Jinmao managed to have both his sons Geng Jingzhong and Geng Zhaozhong 耿昭忠 become court attendants under the
Shunzhi Emperor The Shunzhi Emperor (15 March 1638 – 5 February 1661), also known by his temple name Emperor Shizu of Qing, personal name Fulin, was the second Emperor of China, emperor of the Qing dynasty, and the first Qing emperor to rule over China pro ...
and married Aisin Gioro women, with Prince Abatai's granddaughter marrying Geng Zhaozhong 耿昭忠 and Haoge's (a son of Hong Taiji) daughter marrying Geng Jingzhong. A daughter 和硕柔嘉公主 of the Manchu Aisin Gioro Prince Yolo 岳樂 ( Prince An) was wedded to Geng Juzhong 耿聚忠 who was another son of Geng Jingmao. The fourteenth daughter of Kangxi ( 和硕悫靖公主) was wedded to Sun Chengen, the son ( 孫承恩) of Sun Sike (Sun Ssu-k'o) 孫思克, a Han bannerman.


Korea

The Silla Kingdom had a practice that limited the succession to the throne to members of the ''seonggol'', or "sacred bone", rank. To maintain their "sacred bone" rank, members of this caste often intermarried with one another in the same fashion that European royals intermarried to maintain a "pure" royal pedigree. The
Goryeo dynasty Goryeo (; ) was a Korean state founded in 918, during a time of national division called the Later Three Kingdoms period, that unified and ruled the Korea, Korean Peninsula until the establishment of Joseon in 1392. Goryeo achieved what has b ...
had a history of incestuous marriage within the royal family in its early years, starting from Gwangjong, the fourth king, who married his half-sister Queen Daemok. To avoid scandals, the female members of the dynasty would be ceremonially adopted by their maternal families after birth. This practice of dynastic incest ended with the overthrow of Queen Heonae, the mother of Mokjong, the seventh king, after she attempted to seize the throne for herself and her illegitimate sons by placing these sons as Mokjong's heir, only to be foiled by a coup masterminded by the Goryeo general Kang Cho. After the Second Manchu invasion of Korea,
Joseon Joseon ( ; ; also romanized as ''Chosun''), officially Great Joseon (), was a dynastic kingdom of Korea that existed for 505 years. It was founded by Taejo of Joseon in July 1392 and replaced by the Korean Empire in October 1897. The kingdom w ...
Korea was forced to give several of their royal princesses as concubines to the Qing Manchu regent Prince
Dorgon Dorgon (17 November 1612 – 31 December 1650) was a Manchu prince and regent of the early Qing dynasty. Born in the House of Aisin-Gioro as the 14th son of Nurhaci (the founder of the Later Jin dynasty, which was the predecessor of the Qi ...
. In 1650, Dorgon married the Korean Princess Uisun (義順). She was a collateral branch of the Korean royal family, and daughter of Yi Gae-yun (李愷胤). Dorgon married two Korean princesses at Lianshan.


Japan

The Japanese may not have seen intermarriage between them and the royal dynasties of the
Korean Empire The Korean Empire, officially the Empire of Korea or Imperial Korea, was a Korean monarchical state proclaimed in October 1897 by King Gojong of the Joseon dynasty. The empire lasted until the Japanese annexation of Korea in August 1910. Dur ...
damaging to their prestige either.Kowner, p.478 According to the
Shoku Nihongi The is an imperially-commissioned Japanese history text. Completed in 797, it is the second of the '' Six National Histories'', coming directly after the and followed by ''Nihon Kōki''. Fujiwara no Tsugutada and Sugano no Mamichi served as t ...
, an imperially commissioned record of Japanese history completed in 797, Emperor Kanmu who ruled from 781 to 806 was the son of a Korean concubine, Takano no Niigasa, who was descended from King Muryeong of
Baekje Baekje or Paekche (; ) was a Korean kingdom located in southwestern Korea from 18 BCE to 660 CE. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla. While the three kingdoms were in separate existence, Baekje had the h ...
, one of the
Three Kingdoms of Korea The Three Kingdoms of Korea or Samhan (Goguryeo, Baekje and Silla) competed for hegemony over the Korea, Korean Peninsula during the ancient period of History of Korea, Korean history. During the Three Kingdoms period (), many states and statele ...
. In 1920, Crown Prince Yi Un of Korea married Princess Masako of Nashimoto and, in May 1931,
Yi Geon Colonel Prince Yi Geon (October 28, 1909 – December 21, 1990), also Ri Ken and , was a Korean prince and a cavalry officer in the Imperial Japanese Army during World War II. The first son of Prince Yi Kang of Korean Empire, Korea by Lady Jeon ...
, grandson of
Gojong of Korea Gojong (; 8 September 1852 – 21 January 1919), personal name Yi Myeongbok (), later Yi Hui (), also known as the Gwangmu Emperor (), was the penultimate List of monarchs of Korea, Korean monarch. He ruled Korea for 43 years, from 1864 to 19 ...
, was married to Matsudaira Yosiko, a cousin of Princess Masako. The Japanese saw these marriages as a way to secure their colonial rule of Korea and introduce Japanese blood in to the Korean royal House of Yi.


Europe


Ancient Rome

While Roman emperors almost always married wives who were also Roman citizens, the ruling families of the empire's client kingdoms in the
Near East The Near East () is a transcontinental region around the Eastern Mediterranean encompassing the historical Fertile Crescent, the Levant, Anatolia, Egypt, Mesopotamia, and coastal areas of the Arabian Peninsula. The term was invented in the 20th ...
and
North Africa North Africa (sometimes Northern Africa) is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region. However, it is sometimes defined as stretching from the Atlantic shores of t ...
often contracted marriages with other royal houses to consolidate their position. These marriages were often contracted with the approval, or even at the behest, of the Roman emperors themselves. Rome thought that such marriages promoted stability among their client states and prevented petty local wars that would disturb the
Pax Romana The (Latin for ) is a roughly 200-year-long period of Roman history that is identified as a golden age of increased and sustained Roman imperialism, relative peace and order, prosperous stability, hegemonic power, and regional expansion, a ...
. Glaphyra of Cappadocia was known to have contracted three such royal intermarriages: with Juba II&I, King of Numidia and Mauretania, Alexander of Judea and Herod Archelaus, Ethnarch of Samaria.Roller, p.251 Other examples from the Ancient Roman era include: * Polemon II, King of Pontus and Berenice of Judea. Polemon later married Julia Mamaea of Emesa, while Berenice was previously married to Herod of Chalcis. * Aristobulus IV of Judea and Berenice of Judea * Aristobulus Minor of Judea and Iotapa of Emesa * Gaius Julius Alexander and Julia Iotapa * Sohaemus of Emesa and Drusilla * Tiberius Julius Aspurgus and Gepaepyris * Cotys III and
Antonia Tryphaena Antonia Tryphaena also known as Tryphaena of Thrace or Tryphaena (Ancient Greek, Greek: Ἀντωνία Τρύφαινα or Τρυφαίνη, 10 BC – 55 AD) was a Kingdom of Pontus, Pontian Princess and a Ancient Rome, Roman Client Queen of Sapa ...
* Tiberius Julius Aspurgus and Gepaepyris *
Herod Antipas Herod Antipas (, ''Hērṓidēs Antípas''; ) was a 1st-century ruler of Galilee and Perea. He bore the title of tetrarch ("ruler of a quarter") and is referred to as both "Herod the Tetrarch" and "King Herod" in the New Testament. He was a s ...
and Phasa'el of Nabatea * Iotapa and Sampsiceramus II of Emesa


Byzantine Empire

Though some emperors, such as
Justin I Justin I (; ; 450 – 1 August 527), also called Justin the Thracian (; ), was Roman emperor from 518 to 527. Born to a peasant family, he rose through the ranks of the army to become commander of the imperial guard and when Emperor Anastasi ...
and
Justinian I Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565. His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
, took low-born wives, dynastic intermarriages in imperial families were not unusual in the Byzantine Empire. Following the fall of Constantinople in 1204, the ruling families, the Laskarides and then the
Palaiologoi The House of Palaiologos ( Palaiologoi; , ; female version Palaiologina; ), also found in English-language literature as Palaeologus or Palaeologue, was a Byzantine Greek noble family that rose to power and produced the last and longest-ruling d ...
, thought it prudent to marry into foreign dynasties. One early example is the marriage of John Doukas Vatatzes with Constance, the daughter of Emperor Frederick II of the
Holy Roman Empire The Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a polity in Central and Western Europe, usually headed by the Holy Roman Emperor. It developed in the Early Middle Ages, and lasted for a millennium ...
, to seal their alliance.Ostrogorsky, p.441 After establishing an alliance with the
Mongols Mongols are an East Asian ethnic group native to Mongolia, China ( Inner Mongolia and other 11 autonomous territories), as well as the republics of Buryatia and Kalmykia in Russia. The Mongols are the principal member of the large family o ...
in 1263,
Michael VIII Palaiologos Michael VIII Palaiologos or Palaeologus (; 1224 – 11 December 1282) reigned as Byzantine emperor from 1261 until his death in 1282, and previously as the co-emperor of the Empire of Nicaea from 1259 to 1261. Michael VIII was the founder of th ...
married two of his daughters to Mongol khans to cement their agreement: his daughter Euphrosyne Palaiologina was married to Nogai Khan of the
Golden Horde The Golden Horde, self-designated as ''Ulug Ulus'' ( in Turkic) was originally a Mongols, Mongol and later Turkicized khanate established in the 13th century and originating as the northwestern sector of the Mongol Empire. With the division of ...
, and his daughter
Maria Palaiologina Maria Palaiologina () was the daughter of the Byzantine Empire, Byzantine emperor Michael VIII Palaiologos () who became the wife of the Mongol ruler Abaqa Khan, and an influential Christian leader among the Mongols. After Abaqa's death, she beca ...
, was married to Abaqa Khan of the
Ilkhanate The Ilkhanate or Il-khanate was a Mongol khanate founded in the southwestern territories of the Mongol Empire. It was ruled by the Il-Khans or Ilkhanids (), and known to the Mongols as ''Hülegü Ulus'' (). The Ilkhanid realm was officially known ...
. Later in the century,
Andronikos II Palaiologos Andronikos II Palaiologos (; 25 March 1259 – 13 February 1332), Latinization of names, Latinized as Andronicus II Palaeologus, reigned as Byzantine emperor from 1282 to 1328. His reign marked the beginning of the recently restored em ...
agreed to marital alliances with Ghazan of the Ilkhanate and
Toqta Tokhta (also spelled Toqta, Toktu, Tokhtai, Tochtu or Tokhtogha; died ) was Khan of the Golden Horde from 1291 to 1312. He was a son of Mengu-Timur and a great-grandson of Batu Khan. His name "Tokhtokh" means "hold/holding" in the Mongolian ...
and Uzbeg of the Golden Horde, which were quickly followed by their marriages to his daughters. The Grand Komnenoi of the
Empire of Trebizond The Empire of Trebizond or the Trapezuntine Empire was one of the three successor rump states of the Byzantine Empire that existed during the 13th through to the 15th century. The empire consisted of the Pontus, or far northeastern corner of A ...
were famed for marrying their daughters to their neighbours as acts of diplomacy. Theodora Megale Komnene, daughter of John IV, was married to Uzun Hassan, lord of the
Aq Qoyunlu The Aq Qoyunlu or the White Sheep Turkomans (, ; ) was a culturally Persianate society, Persianate,Kaushik Roy, ''Military Transition in Early Modern Asia, 1400–1750'', (Bloomsbury, 2014), 38; "Post-Mongol Persia and Iraq were ruled by two trib ...
, to seal an alliance between the Empire and the so-called White Sheep. Although the alliance failed to save Trebizond from its eventual defeat, and despite being a devout Christian in a Muslim state, Theodora did manage to exercise a pervasive influence both in the domestic and foreign actions of her husband. Their grandson
Ismail I Ismail I (; 17 July 1487 – 23 May 1524) was the founder and first shah of Safavid Iran, ruling from 1501 until his death in 1524. His reign is one of the most vital in the history of Iran, and the Safavid period is often considered the beginn ...
was the founder of the
Safavid dynasty The Safavid dynasty (; , ) was one of Iran's most significant ruling dynasties reigning from Safavid Iran, 1501 to 1736. Their rule is often considered the beginning of History of Iran, modern Iranian history, as well as one of the gunpowder em ...
of Iran Though usually made to strengthen the position of the empire, there are examples of interdynastic marriages destabilising the emperor's authority. When Emperor Andronikos II Palaiologos married his second wife, Eirene of Montferrat, in 1284 she caused a division in the Empire over her demand that her own sons share in imperial territory with,
Michael Michael may refer to: People * Michael (given name), a given name * he He ..., a given name * Michael (surname), including a list of people with the surname Michael Given name * Michael (bishop elect)">Michael (surname)">he He ..., a given nam ...
, his son from his first marriage. She resorted to leaving
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
, the capital of the Byzantine Empire, and setting up her own court in the second city of the Empire,
Thessalonica Thessaloniki (; ), also known as Thessalonica (), Saloniki, Salonika, or Salonica (), is the second-largest city in Greece (with slightly over one million inhabitants in its metropolitan area) and the capital city, capital of the geographic reg ...
.


Medieval and early modern Europe

Careful selection of a spouse was important to maintain the royal status of a family: depending on the law of the land in question, if a prince or king was to marry a commoner who had no royal blood, even if the first-born was acknowledged as a son of a sovereign, he might not be able to claim any of the royal status of his father. Traditionally, many factors were important in arranging royal marriages. One such factor was the amount of territory that the other royal family governed or controlled. Another, related factor was the stability of the control exerted over that territory: when there was territorial instability in a royal family, other royalty would be less inclined to marry into that family. Another factor was political alliance: marriage was an important way to bind together royal families and their countries during peace and war and could justify many important political decisions. The increase in royal intermarriage often meant that lands passed into the hands of foreign houses, when the nearest heir was the son of a native dynasty and a foreign royal.'Charles V', ''Encyclopædia Britannica'' Given the success of the Habsburgs' territorial acquisition-via-inheritance, a motto came to be associated with their dynasty: ''Bella gerant alii, tu, felix Austria, nube!'' ("Let others wage war. You, happy Austria, marry!")Christakes, p.437 Monarchs sometimes went to great lengths to prevent this. On her marriage to
Louis XIV of France LouisXIV (Louis-Dieudonné; 5 September 16381 September 1715), also known as Louis the Great () or the Sun King (), was King of France from 1643 until his death in 1715. His verified reign of 72 years and 110 days is the List of longest-reign ...
,
Maria Theresa Maria Theresa (Maria Theresia Walburga Amalia Christina; 13 May 1717 – 29 November 1780) was the ruler of the Habsburg monarchy from 1740 until her death in 1780, and the only woman to hold the position suo jure, in her own right. She was the ...
, daughter of
Philip IV of Spain Philip IV (, ; 8 April 160517 September 1665), also called the Planet King (Spanish: ''Rey Planeta''), was King of Spain from 1621 to his death and (as Philip III) King of Portugal from 1621 to 1640. Philip is remembered for his patronage of the ...
, was forced to renounce her claim to the Spanish throne. When monarchs or heirs apparent wed other monarchs or heirs, special agreements, sometimes in the form of treaties, were negotiated to determine inheritance rights. The marriage contract of
Philip II of Spain Philip II (21 May 152713 September 1598), sometimes known in Spain as Philip the Prudent (), was King of Spain from 1556, King of Portugal from 1580, and King of Naples and List of Sicilian monarchs, Sicily from 1554 until his death in 1598. He ...
and
Mary I of England Mary I (18 February 1516 – 17 November 1558), also known as Mary Tudor, was Queen of England and Ireland from July 1553 and Queen of Spain as the wife of King Philip II from January 1556 until her death in 1558. She made vigorous ...
, for example, stipulated that the maternal possessions, as well as
Burgundy Burgundy ( ; ; Burgundian: ''Bregogne'') is a historical territory and former administrative region and province of east-central France. The province was once home to the Dukes of Burgundy from the early 11th until the late 15th century. ...
and the Low Countries, were to pass to any future children of the couple, whereas the remaining paternal possessions (including Spain,
Naples Naples ( ; ; ) is the Regions of Italy, regional capital of Campania and the third-largest city of Italy, after Rome and Milan, with a population of 908,082 within the city's administrative limits as of 2025, while its Metropolitan City of N ...
,
Sicily Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...
,
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
) would first of all go to Philip's son Don Carlos, from his previous marriage to Maria Manuela of Portugal. If Carlos were to die without any descendants, only then would they pass to the children of his second marriage.Verzijl, p.301 On the other hand, the Franco-Scottish treaty that arranged the 1558 marriage of
Mary, Queen of Scots Mary, Queen of Scots (8 December 1542 – 8 February 1587), also known as Mary Stuart or Mary I of Scotland, was List of Scottish monarchs, Queen of Scotland from 14 December 1542 until her forced abdication in 1567. The only surviving legit ...
and
Francis Francis may refer to: People and characters *Pope Francis, head of the Catholic Church (2013–2025) *Francis (given name), including a list of people and fictional characters * Francis (surname) * Francis, a character played by YouTuber Boogie2 ...
, the son and heir of
Henry II of France Henry II (; 31 March 1519 – 10 July 1559) was List of French monarchs#House of Valois-Angoulême (1515–1589), King of France from 1547 until his death in 1559. The second son of Francis I of France, Francis I and Claude of France, Claude, Du ...
, had it that if the queen died without descendants,
Kingdom of Scotland The Kingdom of Scotland was a sovereign state in northwest Europe, traditionally said to have been founded in 843. Its territories expanded and shrank, but it came to occupy the northern third of the island of Great Britain, sharing a Anglo-Sc ...
would fall to the throne of
Kingdom of France The Kingdom of France is the historiographical name or umbrella term given to various political entities of France in the Middle Ages, medieval and Early modern France, early modern period. It was one of the most powerful states in Europe from th ...
.
Religion Religion is a range of social system, social-cultural systems, including designated religious behaviour, behaviors and practices, morals, beliefs, worldviews, religious text, texts, sanctified places, prophecies, ethics in religion, ethics, or ...
has always been closely tied to European political affairs, and as such it played an important role during marriage negotiations. The 1572 wedding in
Paris Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
of the French princess
Margaret of Valois Margaret of Valois (, 14 May 1553 – 27 March 1615), popularly known as , was List of Navarrese royal consorts, Queen of Navarre from 1572 to 1599 and Queen of France from 1589 to 1599 as the consort of Henry IV of France and III of Navarre. Ma ...
to the leader of France's
Huguenot The Huguenots ( , ; ) are a Religious denomination, religious group of French people, French Protestants who held to the Reformed (Calvinist) tradition of Protestantism. The term, which may be derived from the name of a Swiss political leader, ...
s, Henry III of Navarre, was ostensibly arranged to effect a ''rapprochement'' between the nation's Catholics and Protestants, but proved a ruse for the St. Bartholomew's Day massacre.anselme, p.145 After the
English Reformation The English Reformation began in 16th-century England when the Church of England broke away first from the authority of the pope and bishops Oath_of_Supremacy, over the King and then from some doctrines and practices of the Catholic Church ...
, matches between English monarchs and
Roman Catholic The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...
princesses were often unpopular, especially so when the prospective queen consort was unwilling to convert, or at least practice her faith discreetly. Passage of the
Act of Settlement 1701 The Act of Settlement ( 12 & 13 Will. 3. c. 2) is an act of the Parliament of England that settled the succession to the English and Irish crowns to only Protestants, which passed in 1701. More specifically, anyone who became a Roman Catho ...
disinherited any heir to the throne who married a Catholic. Other ruling houses, such as the Romanovs and Habsburgs, have at times also insisted on dynastic marriages only being contracted with people of a certain faith or those willing to convert. When in 1926 Astrid of Sweden married Leopold III of Belgium, it was agreed that her children would be raised as Catholics but she was not required to give up Lutheranism, although she did eventually choose to convert in 1930.Beéche, p.257 Some potential matches were abandoned due to irreconcilable religious differences. For example, plans for the marriage of the Catholic Władysław IV Vasa and the Lutheran Elisabeth of Bohemia, Princess Palatine proved unpopular with Poland's largely Catholic nobility and were quietly dropped. Marriages among ruling dynasties and their subjects have at times been common, with such alliances as that of Edward the Confessor, Edward the Confessor, King of England with Edith of Wessex and Władysław II Jagiełło, Władysław II Jagiełło, King of Poland with Elizabeth Granowska being far from unheard of in medieval Europe. However, as dynasty, dynasties approached Absolute monarchy, absolutism and sought to preserve loyalty among competing members of the nobility, most eventually distanced themselves from kinship ties to local nobles by marrying abroad. Marriages with subjects brought the king back down to the level of those he ruled, often stimulating the ambition of his consort's family and evoking jealousy—or disdain—from the nobility. The notion that monarchs should marry into the dynasties of other monarchs to end or prevent war was, at first, a policy driven by pragmatism. During the era of Absolute monarchy, absolutism, this practice contributed to the notion that it was socially, as well as politically, disadvantageous for members of ruling families to intermarry with their subjects and pass over the opportunity for marriage into a foreign dynasty.


Post World War I era

In modern times, among European royalty at least, marriages between royal dynasties have become much rarer than they once were. This happens to avoid inbreeding, since many royal families share common ancestors, and therefore share much of the genetic pool. Members of Europe's dynasties increasingly married members of hereditary title, titled noble families, including George VI, George VI of the United Kingdom, Prince Henry, Duke of Gloucester, Mary, Princess Royal and Countess of Harewood, Prince Michael of Kent, Charles III, Charles III of the United Kingdom, Baudouin of Belgium, Albert II of Belgium, Prince Amedeo of Belgium, Franz Joseph II, Prince of Liechtenstein, Hans-Adam II, Prince of Liechtenstein, Hans-Adam II of Liechtenstein, Prince Constantin of Liechtenstein, Princess Nora of Liechtenstein (the Liechtensteins, originally an Austrian noble family, always married nobles much more often than royals), Princess Désirée, Baroness Silfverschiöld, Infanta Pilar, Duchess of Badajoz, Infanta Elena, Duchess of Lugo, Princess Marie Adelaide of Luxembourg, Princess Marie Gabrielle of Luxembourg, Guillaume, Hereditary Grand Duke of Luxembourg, and Princess Charlotte, Duchess of Valentinois or untitled nobility as Philippe of Belgium and Beatrix of the Netherlands, and very often commoners, as Carl XVI Gustaf, Carl XVI Gustaf of Sweden, Victoria, Crown Princess of Sweden, Harald V, Harald V of Norway, Haakon, Crown Prince of Norway, Henri, Grand Duke of Luxembourg, Henri of Luxembourg, Felipe VI, Felipe VI of Spain, Willem-Alexander of the Netherlands, Margrethe II, Margrethe II of Denmark, Frederik X, Frederik X of Denmark, William, Prince of Wales and Albert II, Prince of Monaco, Albert II of Monaco have done. Among Europe's current kings, queens and heirs apparent, only Alois, Hereditary Prince of Liechtenstein married a member of a foreign dynasty, as did the abdicated Juan Carlos I, Juan Carlos I of Spain.


=Members of two reigning houses

= Examples of royal intermarriage since 1918 include: * Prince Nikolaus of Liechtenstein and Princess Margaretha of Liechtenstein, Princess Margaretha of LuxembourgdeBadts de Cugnac, pp.680–681 (1982, most recent example of intermarriage between two European dynasties reigning at the time of the wedding, ) * Jean, Grand Duke of Luxembourg, Hereditary Grand Duke Jean of Luxembourg and Princess Joséphine-Charlotte of Belgium (1953) * Elizabeth II, Princess Elizabeth of the United Kingdom and Prince Philip, Duke of Edinburgh, Prince Philip of Greece and Denmark (1947) * Peter II of Yugoslavia and Alexandra of Yugoslavia, Princess Alexandra of Greece and Denmark (1944) * Prince Aimone, Duke of Aosta, Prince Aimone, Duke of Spoleto and Princess Irene, Duchess of Aosta, Princess Irene of Greece and Denmark (1939) * Frederik IX of Denmark, Crown Prince Frederick of Denmark and Ingrid of Sweden, Princess Ingrid of Sweden (1935) * Prince George, Duke of Kent and Princess Marina of Greece and Denmark (1934) * Boris III of Bulgaria and Giovanna of Italy, Princess Giovanna of Italy (1930) * Umberto II of Italy, Umberto, Prince of Piedmont and Marie-José of Belgium, Princess Marie José of Belgium (1930) * Olav V of Norway, Crown Prince Olav of Norway and Princess Märtha of Sweden (1929) * Leopold III of Belgium, Prince Leopold, Duke of Brabant and Astrid of Sweden, Princess Astrid of Sweden (1926) * Prince Paul of Yugoslavia and Princess Olga of Greece and Denmark (1923) * Alexander I of Yugoslavia and Maria of Yugoslavia, Princess Maria of Romania (1922) * Carol II of Romania, Crown Prince Carol of Romania and Helen of Greece and Denmark, Princess Helen of Greece and Denmark (1921) * George II of Greece, Crown Prince George of Greece and Elisabeth of Romania, Princess Elisabeth of Romania (1921) * Prince Axel of Denmark and Princess Margaretha of Sweden (1919)


=Members of one reigning house and one non-reigning house

= Examples since 1918 include: * Caroline, Princess of Hanover, Princess Caroline of Monaco and Ernst August von Hannover (born 1954), Ernst August, Prince of Hanover (1999) * Alois, Hereditary Prince of Liechtenstein and Sophie, Hereditary Princess of Liechtenstein, Duchess Sophie in Bavaria (1993) * Prince Gundakar of Liechtenstein and Princess Marie of Liechtenstein (born 1959), Princess Marie of Orléans (1989) * Princess Astrid of Belgium and Prince Lorenz of Belgium, Archduke Lorenz of Austria-Este (1984) * Archduchess Marie-Astrid of Austria, Princess Marie-Astrid of Luxembourg and Archduke Carl Christian of Austria-Hungary, Austria (1982) * Princess Barbara of Liechtenstein and Prince Alexander of Yugoslavia (1924–2016), Prince Alexander of Yugoslavia (1973) * Princess Benedikte of Denmark and Richard, 6th Prince of Sayn-Wittgenstein-Berleburg, Richard, Hereditary Prince of Sayn-Wittgenstein-Berleburg (1968) * Princess Irene of the Netherlands and Carlos Hugo, Duke of Parma, Prince Carlos Hugo of Parma (1964) * Queen Sofía of Spain, Princess Sophia of Greece and Denmark and Juan Carlos I, Juan Carlos, Prince of Asturias (1962) * Princess Birgitta of Sweden and Prince Johann Georg of Hohenzollern (1961) * Prince Alexander of Liechtenstein (1929–2012), Prince Alexander of Liechtenstein and Princess Josephine of Löwenstein-Wertheim-Rosenberg (1961) * Princess Alix of Luxembourg and Antoine, Prince of Ligne, Prince Antoine de Ligne (1950) * Prince Heinrich of Liechtenstein and Archduchess Elisabeth of Austria (1922–1993), Archduchess Elisabeth of Austria (1949) * Prince Karl Alfred of Liechtenstein and Archduchess Agnes Christina of Austria-Hungary, Austria (1949) * Princess Eugénie of Greece and Denmark and Raimundo, 2nd Duke of Castel Duino (1949) * Prince Georg Hartmann of Liechtenstein and Duchess Maria Christina of Kingdom of Württemberg, Württemberg (1948) * Princess Sophie of Greece and Denmark and Prince George William of Hanover (1946) * Prince Hans-Moritz of Liechtenstein and Princess Clotilde of Thurn and Taxis (1944) * Princess Maria Francesca of Savoy and Prince Luigi of House of Bourbon-Parma, Bourbon-Parma (1939) * Prince Eugenio, Duke of Genoa, Prince Eugenio, Duke of Ancona and Princess Lucia of House of Bourbon-Two Sicilies, Bourbon-Two Sicilies (1938) * Princess Eugénie of Greece and Denmark and Dominik Rainer Radziwiłł, Prince Dominik Rainer Radziwiłł (1938) * Paul of Greece, Crown Prince Paul of Greece and Frederica of Hanover, Princess Frederica of Hanover (1938) * Princess Feodora of Denmark and Prince Christian of Schaumburg-Lippe (1937) * Princess Alexandrine-Louise of Denmark and Count Luitpold of Castell-Castell (1937) * Juliana of the Netherlands, Princess Juliana of the Netherlands and Prince Bernhard of Lippe-Biesterfeld (1936) * Prince Gustaf Adolf, Duke of Västerbotten and Princess Sibylla of Saxe-Coburg and Gotha (1932) * Princess Theodora of Greece and Denmark (1906–1969), Princess Theodora of Greece and Denmark and Berthold, Margrave of Baden (1931) * Princess Ileana of Romania and Archduke Anton of Austria (1931) * Princess Margarita of Greece and Denmark and Gottfried, Prince of Hohenlohe-Langenburg, Gottfried, Hereditary Prince of Hohenlohe-Langenburg (1931) * Princess Cecilie of Greece and Denmark and Georg Donatus, Hereditary Grand Duke of Hesse (1931) * Princess Sophie of Greece and Denmark and Prince Christoph of Hesse (1930) * Princess Hilda of Luxembourg (1897–1979), Princess Hilda of Luxembourg and Adolph Schwarzenberg, Prince Adolph of Schwarzenberg (1930) * Prince Christopher of Greece and Denmark and Princess Françoise of Orléans (1902–1953), Princess Françoise of Orléans (1929) * Prince Filiberto, Duke of Genoa, Prince Filiberto, Duke of Pistoia and Princess Lydia of Arenberg (1928) * Prince Amedeo, Duke of Aosta, Prince Amedeo, Duke of Apulia and Princess Anne of Orléans (1927) * Princess Mafalda of Savoy and Philipp, Landgrave of Hesse, Prince Philipp of Hesse (1925) * Princess Nadezhda of Bulgaria and Duke Albrecht Eugen of Kingdom of Württemberg, Württemberg (1924) * Princess Elisabeth of Luxembourg (1901–1950), Princess Elisabeth of Luxembourg and Prince Ludwig Philipp of Thurn and Taxis (1922) * Princess Margaret of Denmark and Prince René of Bourbon-Parma (1921) * Princess Sophie of Luxembourg and Prince Ernst Heinrich of Saxony (1921) * Princess Antonia of Luxembourg and Rupprecht, Crown Prince of Bavaria (1921) * Prince Karl Aloys of Liechtenstein and Princess Elisabeth of Urach (1921) * Princess Maria Bona of Savoy-Genoa and Prince Konrad of Bavaria (1921) * Charlotte, Grand Duchess of Luxembourg and Prince Felix of Bourbon-Parma (1919)


=Modern examples of dynastic intra-marriage

= Examples since 1918 include: * David Bagration of Mukhrani, Prince David Bagration of Mukhrani and Ana Bagration-Gruzinsky, Princess Ana Bagration-Gruzinsky (2009) * Constantine II of Greece and Queen Anne-Marie of Greece, Princess Anne-Marie of Denmark (1964) * Prince Ludwig of Bavaria (1913–2008), Prince Ludwig of Bavaria and Princess Irmingard of Bavaria (1950) * Pedro Gastão of Orléans-Braganza, Prince Pedro Gastão of Orléans-Braganza and Princess María de la Esperanza of House of Bourbon-Two Sicilies, Bourbon-Two Sicilies (1944) * Infante Alfonso, Duke of Calabria, Infante Alfonso of Spain and Infanta Alicia, Duchess of Calabria, Princess Alicia of Bourbon-Parma (1936) * Infante Juan, Count of Barcelona, Infante Juan of Spain and Princess María de las Mercedes of Bourbon-Two Sicilies (1935) * Knud, Hereditary Prince of Denmark, Prince Knud of Denmark and Princess Caroline-Mathilde of Denmark (1933) * Henri, Count of Paris (1908–1999), Prince Henri of Orléans and Isabelle, Countess of Paris, Princess Isabelle of Orléans-Braganza (1931) * Prince Feodor Alexandrovich of Russia and Irina Paley, Princess Irina Pavlovna Paley (1923)


=Marriages between members of non-reigning houses

= Examples since 1918 include: * Georg Friedrich Prinz von Preussen, Georg Friedrich, Prince of Prussia and Sophie, Princess of Prussia, Princess Sophie of Isenburg (2011) * Aimone di Savoia Aosta (born 1967), Prince Aimone, Duke of Apulia and Princess Olga of Savoy-Aosta, Princess Olga of Greece (2008) * Anna von Bayern, Princess Anna of Sayn-Wittgenstein-Berleburg and Prince Manuel of House of Wittelsbach, Bavaria (2005) * Princess Maria Pia of Bourbon-Parma, Princess Maria Pia of Savoy and Prince Michel of Bourbon-Parma (2003) * Alexander, Count of Schönburg-Glauchau and Princess Irina of Hesse-Kassel, Hesse (1999) * Georg von Habsburg, Archduke Georg of Austria and Eilika Duchess of Oldenburg, Duchess Eilika of Oldenburg (1997) * Simeon von Habsburg, Archduke Simeon of Austria and Princess María of House of Bourbon-Two Sicilies, Bourbon-Two Sicilies (1996) * Stephan, Prince of Lippe, Stephan, Hereditary Prince of Lippe and Countess Maria of Solms-Laubach (1994) * Sophie Habsburg, Archduchess Sophie of Austria and Mariano Hugo, Prince of Windisch-Graetz (1990) * Alexander Prinz von Sachsen, Prince Alexander of Saxe-Gessaphe and Princess Gisela of Kingdom of Bavaria, Bavaria (1987) * Prince Karl Emich of Leiningen and Princess Margarita of House of Hohenlohe, Hohenlohe-Oehringen (1984) * Christoph Prinz zu Schleswig-Holstein, Christoph, Prince of Schleswig-Holstein and Princess Elisabeth of Lippe-Weissenfeld (1981) * Prince Ernest Augustus of Hanover (born 1914), Prince Ernest Augustus of Hanover and Countess Monika zu Solms-Laubach (1981) * Michel, Prince of Ligne, Prince Michel of Ligne and Princess Eleonora of House of Orléans-Braganza, Orléans-Braganza (1981) * Johannes von Thurn und Taxis, Johannes, Hereditary Prince of Thurn and Taxis and Gloria von Thurn und Taxis, Countess Gloria von Schönburg-Glauchau (1980) * Charles, Prince Napoléon, Prince Charles Napoléon and Princess Béatrice of Bourbon-Two Sicilies (1978) * Heinrich, Prince of Fürstenberg, Heinrich, Hereditary Prince of Fürstenberg and Princess Maximiliane of Windisch-Graetz (1976) * Grand Duchess Maria Vladimirovna of Russia and Franz Wilhelm Prinz von Preussen, Prince Franz Wilhelm of Prussia (1976) * Alexander, Crown Prince of Yugoslavia and Princess Maria da Glória of House of Orléans-Braganza, Orléans-Braganza (1972) * Wolfgang-Ernst, Prince of Ysenburg and Büdingen, Wolfgang-Ernst, Hereditary Prince of Ysenburg and Büdingen and Princess Leonille of Sayn-Wittgenstein-Berleburg (1967) * Princess Maria Cristina of Savoy-Aosta and Prince Casimir of House of Bourbon-Two Sicilies, Bourbon-Two Sicilies (1967) * Maximilian, Margrave of Baden and Archduchess Valerie of Grand Duchy of Tuscany, Austria-Tuscany (1966) * Duke Friedrich August of Oldenburg and Princess Marie Cécile of German Empire, Prussia (1965) * Alois-Konstantin, Prince of Löwenstein-Wertheim-Rosenberg, Alois-Konstantin, Hereditary Prince of Löwenstein-Wertheim-Rosenberg and Princess Anastasia of House of Hohenzollern, Prussia (1965) * Kraft, Prince of Hohenlohe-Langenburg and Princess Charlotte of House of Croÿ, Croÿ (1965) * Infante Carlos, Duke of Calabria, Prince Carlos, Duke of Calabria and Princess Anne, Duchess of Calabria, Princess Anne of Orléans (1965) * Carl Gregor Herzog zu Mecklenburg, Duke Carl Gregor of Mecklenburg and Princess Maria Margarethe of Hohenzollern-Sigmaringen (1965) * Prince Amedeo, Duke of Aosta (1943–2021), Prince Amedeo, Duke of Aosta and Princess Claude of Orléans (1964) * Moritz, Landgrave of Hesse, Prince Moritz of Hesse and Princess Tatiana of Sayn-Wittgenstein-Berleburg (1964) * Prince Andrew of Yugoslavia and Princess Kira Melita of Leiningen family, Leiningen (1963) * Prince Friedrich Christian of Schaumburg-Lippe and Princess Marie Louise of Schleswig-Holstein-Sonderburg-Glücksburg (1962) * Maria Emanuel, Margrave of Meissen, Prince Maria Emanuel of Saxony and Princess Anastasia of House of Ascania, Anhalt (1962) * Alexandra Prinzessin von Hannover, Princess Alexandra of Ysenburg and Büdingen and Prince Welf Henry of House of Hanover, Hanover (1960) * Carl, Duke of Württemberg, Duke Carl of Württemberg and Diane, Duchess of Württemberg, Princess Diane of Orléans (1960) * Henri, Count of Paris (1933–2019), Henri, Count of Clermont and Duchess Marie-Thérèse of Württemberg (1957) * Prince Tomislav of Yugoslavia and Princess Margarita of Baden (1957) * Princess Marie Louise of Bulgaria and Prince Karl of Leiningen (1957) * Prince Andrew of Yugoslavia and Princess Christina of Hesse (1956) * George, Duke of Mecklenburg and Archduchess Charlotte of Austria (1956) * Prince Alfonso of Hohenlohe-Langenburg and Ira von Fürstenberg, Princess Virginia von Fürstenberg (1955) * Princess Diana of Bourbon-Parma and Prince Franz Josef of Hohenzollern-Sigmaringen, Hohenzollern (1955) * Princess Maria Pia of Bourbon-Parma, Princess Maria Pia of Savoy and Prince Alexander of Yugoslavia (1924–2016), Prince Alexander of Yugoslavia (1955) * Duke Christian Louis of Mecklenburg and Princess Barbara of Kingdom of Prussia, Prussia (1954) * Heinrich IV, Prince Reuss of Köstritz and Princess Marie Luise of House of Salm, Salm-Horstmar (1954) * Robert, Archduke of Austria-Este and Margherita, Archduchess of Austria-Este, Princess Margherita of Savoy-Aosta (1953) * Archduke Felix of Austria and Princess Anna-Eugénie of House of Arenberg, Arenberg (1952) * Prince Ernest Augustus of Hanover (born 1914), Prince Ernest Augustus of Hanover and Princess Ortrud of Schleswig-Holstein-Sonderburg-Glücksburg (1951) * Anton-Günther, Duke of Oldenburg, Duke Anton-Günther of Oldenburg and Ameli, Duchess of Oldenburg, Princess Ameli of Löwenstein-Wertheim-Freudenberg (1951) * Otto von Habsburg, Archduke Otto of Austria and Regina von Habsburg, Princess Regina of Saxe-Meiningen (1951) * Friedrich Wilhelm Prinz von Hohenzollern, Prince Friedrich Wilhelm of Hohenzollern and Princess Margarita of Leiningen family, Leiningen (1951) * Emich Kyrill, Prince of Leiningen and Duchess Eilika of Grand Duchy of Oldenburg, Oldenburg (1950) * Archduke Carl Ludwig of Austria (1918–2007), Archduke Carl Ludwig of Austria and Archduchess Yolande of Austria, Princess Yolande of Ligne (1950) * Grand Duke Vladimir Kirillovich of Russia and Leonida Bagration of Mukhrani, Princess Leonida Bagration of Mukhrani (1948) * Michael I of Romania and Anne of Romania, Princess Anne of Bourbon-Parma (1948) * Princess Marie Alix of Schaumburg-Lippe and Peter, Duke of Schleswig-Holstein, Peter, Hereditary Prince of Schleswig-Holstein (1947) * Irakli Bagration of Mukhrani, Prince Irakli Bagration of Mukhrani and Infanta María de las Mercedes of Spain (1911–1953), Infanta María de las Mercedes of Spain (1946) * Georg Alexander, Duke of Mecklenburg, Duke Georg Alexander of Mecklenburg and Archduchess Ilona of Austria (1946) * Prince Hubertus of Prussia and Princess Magdalena Reuss of Köstritz (1943) * Duarte Nuno, Duke of Braganza and Princess Maria Francisca of Orléans-Braganza (1942) * Konstantin Prinz von Bayern, Prince Konstantin of Bavaria and Princess Maria Adelgunde of Hohenzollern-Sigmaringen, Hohenzollern (1942) * Friedrich Josias, Prince of Saxe-Coburg and Gotha, Prince Friedrich Josias of Saxe-Coburg and Gotha and Countess Viktoria-Luise of Solms-Baruth (1942) * Prince Karl Franz of Prussia and Princess Henriette of Schönaich-Carolath (1940) * Duchess Woizlawa Feodora of Mecklenburg and Prince Heinrich I Principality of Reuss-Gera, Reuss of Köstritz (1939) * Princess Herzeleide of Prussia and Karl Biron family, von Biron (1938) * Louis Ferdinand, Prince of Prussia, Prince Louis Ferdinand of Prussia and Grand Duchess Kira Kirillovna of Russia (1938) * Archduke Gottfried of Austria and Princess Dorothea of Kingdom of Bavaria, Bavaria (1938) * Friedrich Günther, Prince of Schwarzburg and Princess Sophie of Saxe-Weimar-Eisenach (1911–1988), Princess Sophie of Saxe-Weimar-Eisenach (1938) * Princess Marie Eleonore of Albania and Prince Alfred of Schönburg family, Schönburg-Waldenburg (1937) * Pedro Henrique of Orléans-Braganza, Prince Pedro Henrique of Orléans-Braganza and Princess Maria Elisabeth of Bavaria (1937) * Prince Ludwig Ferdinand of Sayn-Wittgenstein-Berleburg and Princess Friederike Juliane of Salm (state), Salm-Horstmar (1935) * Princess Eulalia of Thurn and Taxis and Prince Philipp Ernst of Thurn and Taxis (1929) * Philipp Albrecht, Duke of Württemberg, Duke Philipp Albrecht of Württemberg and Archduchess Rosa of Austria (1928) * Archduke Hubert Salvator of Austria and Princess Rosemary of Salm-Salm (1926) * Grand Duchess Maria Kirillovna of Russia and Karl, Prince of Leiningen (1898–1946), Prince Karl of Leiningen (1925) * Wolrad, Prince of Schaumburg-Lippe, Prince Wolrad of Schaumburg-Lippe and Princess Bathildis of Principality of Schaumburg-Lippe, Schaumburg-Lippe (1925) * Princess Marie Antoinette of Schwarzburg and Friedrich Magnus V, Count of Solms-Wildenfels (1925) * Duke Adolf Friedrich of Mecklenburg and Princess Elisabeth of Stolberg-Rossla (1924) * Archduke Joseph Francis of Austria and Princess Anna of Kingdom of Saxony, Saxony (1924) * Prince Wolfgang of Hesse and Princess Marie Alexandra of Baden (1924) * Philipp Albrecht, Duke of Württemberg, Duke Philipp Albrecht of Württemberg and Archduchess Helena of Austria (1923) * Friedrich Christian, Margrave of Meissen, Prince Friedrich Christian of Saxony and Princess Elisabeth Helene of Thurn and Taxis (1923) * Wilhelm II, German Emperor and Hermine Reuss of Greiz, Princess Hermine Reuss of Greiz (1922) * Josias, Hereditary Prince of Waldeck and Pyrmont and Duchess Altburg of Grand Duchy of Oldenburg, Oldenburg (1922) * Leopold IV, Prince of Lippe and Princess Anna of Ysenburg and Büdingen (1922) * Nikolaus, Hereditary Grand Duke of Oldenburg and Princess Helena of Waldeck and Pyrmont (1899–1948), Princess Helena of Waldeck and Pyrmont (1921) * Karl August, 10th Prince of Thurn and Taxis, Prince Karl August of Thurn and Taxis and Princess Maria Ana of Braganza (1921) * Franz Joseph, Prince of Hohenzollern-Emden, Prince Franz Joseph of Hohenzollern and Princess Maria Alix of Kingdom of Saxony, Saxony (1921) * Princess Marie Adelheid of Lippe and Prince Heinrich XXXV Principality of Reuss-Gera, Reuss of Köstritz (1921) * Franz Joseph, 9th Prince of Thurn and Taxis, Franz Joseph, Hereditary Prince of Thurn and Taxis and Princess Isabel Maria of Braganza (1920) * Frederick, Prince of Hohenzollern, Prince Frederick of Hohenzollern and Princess Margarete Karola of House of Wettin, Saxony (1920) * Princess Marie Adelheid of Lippe and Heinrich XXXII, Prince Reuss of Köstritz (1920) * Princess Karoline Mathilde of Schleswig-Holstein-Sonderburg-Glücksburg and Count Hans of Solms-Baruth (1920) * Prince Waldemar of Prussia (1889–1945), Prince Waldemar of Prussia and Princess Calixta of Lippe-Biesterfeld (1919) * Prince Sigismund of Prussia (1896–1978), Prince Sigismund of Prussia and Princess Charlotte of Saxe-Altenburg (1919) As a result of dynastic intra-marriage all of Europe's reigning hereditary monarchs since 1939 descend from a common ancestor, John William Friso, Prince of Orange. Since Death and state funeral of Elizabeth II, 2022, all of Europe's reigning hereditary monarchs descend from a more recent common ancestor: Louis IX, Landgrave of Hesse-Darmstadt.


Muslim world


Al-Andalus

From the time of the Umayyad conquest of Hispania and throughout the Reconquista, marriage between Spanish and Umayyad Caliphate, Umayyad royals was not uncommon. Early marriages, such as that of Abd al-Aziz ibn Musa and Egilona at the turn of the 8th century, was thought to help establish the legitimacy of Muslim rule on the Iberian Peninsula. Later instances of intermarriage were often made to seal trade treaties between Christian kings and Muslim caliphs.Albany & Salhab, pp.70–71


Ottoman Empire

The marriages of Ottoman sultans and their sons in the fourteenth and fifteenth centuries tended to be with members of the ruling dynasties of neighbouring powers. With little regard for religion, the sultans contracted marriages with both Christians and Muslims; the purpose of these royal intermarriages were purely tactical. Christian consorts of Ottoman sultans include Theodora Kantakouzene (wife of Orhan), Theodora Kantakouzene of Byzantium, Kera Tamara of Bulgaria and Olivera Despina of Serbia in the Middle Ages, Serbia. These Christian states along with Muslim Anatolian beyliks, beyliks of Germiyanids, Germiyan, Sarukhanids, Saruhan, Karamanids, Karaman and Beylik of Dulkadir, Dulkadir were all potential enemies, and marriage was seen as a way of securing alliances with them.Peirce, pp.30–31 Marriage with foreign dynasties seems to have ceased in 1504, with the last marriage of a sultan to a foreign princess being that of Murad II and Mara Branković, daughter of the Serbian ruler Đurađ Branković, in 1435. By this time, the Ottomans had consolidated their power in the area and absorbed or subjugated many of their former rivals, and so marriage alliances were no longer seen as important to their foreign policy. The Islamic principle of ''kafa'a'' discourages the marriages of women to men of differing religion or of inferior social class, status. Neighbouring Muslim powers did not start to give their daughters in marriage to Ottoman princes until the fifteenth century, when they were seen to have grown in importance. This same principle meant that, while Ottoman men were free to marry Christian women, Muslim princesses were prevented from marrying Christian princes.Magill, p.2566


Post World War I era

There are several modern instances of intermarriage between members of the royal families and former royal families of Islamic states (i.e., Jordan, Morocco, Saudi Arabia, the constituent states of the United Arab Emirates, etc.). Examples include: * Muhammad Ali, Prince of the Sa'id, son of Fuad II of Egypt and Noal, Princess of the Sa'id, Princess Noal Zaher Shah, granddaughter of Mohammed Zahir Shah, Zahir Shah of Afghanistan (2013) * Prince Abdul Qawi of Brunei and Tengku Amalin A'ishah Putri of Kelantan (2013) * Khalid bin Hamad Al Khalifa, Sheik Khalid bin Hamad Al Khalifa, son of Hamad bin Isa Al Khalifa, Hamad Al Khalifa, King of Bahrain and Abdullah of Saudi Arabia#Daughters, Princess Sahab bint Abdullah, daughter of Abdullah of Saudi Arabia, Abdullah, King of Saudi Arabia (2011) * Mohammed bin Hamad bin Mohammed Al Sharqi and Latifa bint Mohammed Al Maktoum, daughter of Mohammed bin Rashid Al Maktoum of Dubai (2009) * Nasser bin Hamad Al Khalifa, son of Hamad bin Isa Al Khalifa, Hamad Al Khalifa, King of Bahrain and Shaikha bint Mohammed Al Maktoum, daughter of Mohammed bin Rashid Al Maktoum of Dubai (2009) * Mansour bin Zayed Al Nahyan, Sheik Mansour bin Zayed Al Nahyan, (half-brother of Khalifa bin Zayed Al Nahyan, Emirate of Abu Dhabi, Emir of Abu Dhabi and President of the United Arab Emirates (UAE) ) and Manal bint Mohammed bin Rashid Al Maktoum, Sheika Manal bint Mohammed bin Rashid Al Maktoum, daughter of Mohammed bin Rashid Al Maktoum, Emir of Dubai and Prime Minister of UAE (2005) * Sheikh Mohammed bin Rashid Al Maktoum of Dubai and Haya bint Hussein, Princess Haya bint Hussein of Jordan (2004) * Abdullah of Pahang and Tunku Azizah Aminah Maimunah of Johor (1986) * Ibrahim Ismail of Johor, Ibrahim Ismail, Sultan of Johor and Raja Zarith Sofiah, Raja Zarith Sofia of Perak (1983) * Sirajuddin of Perlis and Tuanku Tengku Fauziah (1967) * Ahmad bin Ali Al Thani and Maryam bint Rashid Al Maktoum (1957) * Abdul Halim of Kedah and Sultanah Bahiyah (1956) * Putra of Perlis and Raja Perempuan Budriah (1941) * Hanzade Sultan (daughter of Şehzade Ömer Faruk), Hanzade Sultan and Prince Muhammed Ali Ibrahim (1941) * Mohamed Abdel Moneim and Neslişah Sultan (daughter of Şehzade Ömer Faruk), Neslişah Sultan, granddaughter of Ottoman Sultan Mehmed VI (1940) * Prince Nayef bin Abdullah and Mihrimah Sultan (daughter of Şehzade Ziyaeddin), Princess Mihrimah Sultan, granddaughter of Ottoman Sultan Mehmed V (1940) * Mohammad Reza Pahlavi of Imperial State of Iran, Iran and Fawzia Fuad of Egypt, Princess Fawzia Fuad of Egypt (1939) * Princess Senije Zogu, Senije Zogu, sister of Zog I of Albania, Zogu I of Albania, and Şehzade Mehmed Abid, son of Abdul Hamid II (1936) *Ahmad Al-Jaber Al-Sabah and Şükriye Sultan (1935). * Azam Jah and Princess Durru Shehvar, daughter of Abdul Mejid II. * Dürrüşehvar Sultan (daughter of Ottoman Caliph Abdulmejid II) and Azam Jah (son of Nizam of Hyderabad Asaf Jah VII) (1931) * Hisamuddin of Selangor and Tengku Ampuan Jemaah (1920) There are also numerous cases of intramarriage between cadet branches within the ruling families from the Arabian Peninsula, including the House of Saud, the House of Sabah, the House of Khalifa, the House of Thani, and the House of Busaid. Other such examples include Idris of Libya, Idris, emir of Cyrenaica and Fatimah el-Sharif (1931) from Senussi, Senussi family, Prince Hamzah bin Hussein and Princess Noor bint Asem (2003), Hussein of Jordan and Dina bint Abdul-Hamid (1955), Talal of Jordan and Zein Al-Sharaf Talal (1934), and Ghazi of Iraq and Aliya bint Ali (1934), all from the Hashemites, Hashemite dynasty.


Oceania


Hawaii

Royal incest was extremely common in the Kingdom of Hawaii and its predecessors, despite being rare in other Polynesian societies. Among the ''aliʻi'', the ruling class, marriage between blood relatives of the first degree was believed to produce children with the highest rank under the ''Kapu (Hawaiian culture), kapu'' system, equal to that of the gods. A marriage between brother and sister was considered "the most perfect and revered union". It was believed that the ''Mana (Oceanian mythology), mana'' of a particular ''aliʻi'' could be increased by incestuous unions. According to O. A. Bushnell, "in several accounts about Hawaiians, an ali’i who was the issue of an incestuous marriage [...] was noted for a splendid body and a superior intelligence". Writers have suggested that this preference for brother–sister incest came about as a way to protect the royal bloodline. Notable instances of incestuous relationships among Hawaiian royalty were those between King Kamehameha II and his half-sister Kamāmalu, which was a fully fledged marriage, and between Kamehameha III and his full sister Nahienaena. In the latter case, the siblings had hoped to marry but their union was opposed by Christian missionaries.


Americas


Inca Peru

The Sapa Inca of Peru frequently married their sisters, such between as the children Huayna Capac: Huáscar married Chuqui Huipa, Atahualpa married Coya Asarpay, and Manco Inca Yupanqui married Cura Ocllo. During and after the Spanish conquest of the Inca Empire, dynastic marriages began to occur between Inca princesses and Spanish conquistadors. The aforementioned Cura Ocllo married Gonzalo Pizarro following the death of her brother-husband, and her sister Quispe Sisa married Francisco Pizarro.


Morganatic marriage

At one time, some dynasties adhered strictly to the concept of royal intermarriage. The Habsburgs, Sicilian and Spanish House of Bourbon, Bourbons, and Romanovs, among others, introduced house laws which governed dynastic marriages; it was considered important that dynasts marry social equals (i.e., other royalty), thereby ruling out even the highest-born non-royal nobles. Those dynasts who contracted undesirable marriages often did so morganatic marriage, morganatically. Generally, this is a marriage between a man of high birth and a woman of lesser status (such as a daughter of a German nobility#Divisions of nobility, low-ranked noble family or a commoner). Usually, neither the bride nor any children of the marriage has a claim on the bridegroom's Non-dynastic, succession rights, titles, precedence, or fee tail, entailed property. The children are considered legitimate for all other purposes and the prohibition against polygamy, bigamy applies. Examples of morganatic marriages include: * Casimir III the Great and Krystyna Rokiczana (1356) * Frederick I, Elector Palatine and Clara Tott (1462) * Philip I, Landgrave of Hesse and Margarethe von der Saale (1540) * Ferdinand II, Archduke of Austria and Philippine Welser (1557) * Cosimo I de' Medici, Grand Duke of Tuscany and Camilla Martelli (1570) * Christian IV of Denmark and Kirsten Munk (1615) * Ferdinando Gonzaga, Duke of Mantua and Camilla Faà (1616) * Charles Philip, Duke of Södermanland and Elizabeth Ribbing (1620) * Charles I Louis, Elector Palatine and Marie Luise von Degenfeld (1658) * John II Casimir Vasa and Claudine Françoise Mignot (1672) * Rudolph Augustus, Duke of Braunschweig-Wolfenbüttel and Rosine Elisabeth Menthe (1681) * Louis XIV and Françoise d'Aubigné, Marquise de Maintenon (1683) * Emmanuel Lebrecht, Prince of Anhalt-Köthen and Gisela Agnes of Rath (1692) * Louis, Grand Dauphin and Marie Émilie de Joly de Choin (1694) * Leopold I, Prince of Anhalt-Dessau and Anna Louise Föhse (1698) * Frederick IV of Denmark and Elisabeth Helene von Vieregg (1703) * Eberhard Louis, Duke of Württemberg and Wilhelmine von Grävenitz (1707) * Augustus Louis, Prince of Anhalt-Köthen and Agnes Wilhelmine von Wuthenau (1722) * Victor Amadeus II and Anna Canalis di Cumiana (1730) * Charles, Duke of Courland and Franciszka Krasińska (1760) * Prince Francis Xavier of Saxony and Maria Chiara Spinucci (1765) * Louis Philippe I, Duke of Orléans and Madame de Montesson, Charlotte Béraud de La Haye de Riou (1773) * Infante Luis of Spain and María Teresa de Vallabriga (1776) * Charles Eugene, Duke of Württemberg and Countess Franziska von Hohenheim (1785) * Frederick William II of Prussia and Julie von Voss (1787) * Charles Frederick, Grand Duke of Baden and Louise Caroline of Hochberg (1787) * Frederick William II of Prussia and Sophie von Dönhoff (1790) * Alexander, Margrave of Brandenburg-Ansbach and Elizabeth Craven (1791) * Grand Duke Konstantin Pavlovich of Russia and Joanna Grudzińska, Countess Joanna Grudna-Grudzińska (1796) * Ferdinand I of the Two Sicilies and Lucia Migliaccio (1814) * Marie Louise, Duchess of Parma and Adam Albert von Neipperg (1821) * Frederick William III of Prussia and Auguste von Harrach (1824) * Archduke John of Austria and Anna Plochl (1829) * Frederick William, Elector of Hesse and Gertrude von Hanau (1831) * Maria Christina of the Two Sicilies and Agustín Fernando Muñoz y Sánchez, 1st Duke of Riánsares, Agustín Fernando Muñoz (1833) * Marie Louise, Duchess of Parma and Charles-René de Bombelles (1834) * Duke Alexander of Württemberg (1804–1885), Duke Alexander of Württemberg and Countess Claudine Rhédey von Kis-Rhéde (1835) * Jérôme Bonaparte and Justine Bartolini-Baldelli (1840) * William I of the Netherlands and Henrietta d'Oultremont (1841) * William II, Elector of Hesse and Emilie Ortlöpp (1841) * William II, Elector of Hesse and Caroline of Berlepsch (1843) * Prince Adalbert of Prussia (1811–1873), Prince Adalbert of Prussia and Therese Elssler (1850) * Frederick VII of Denmark and Louise Rasmussen (1850) * Prince Alexander of Hesse and by Rhine and Julia, Princess of Battenberg, Countess Julia Hauke (1851) * Prince Edward of Saxe-Weimar and Princess Edward of Saxe-Weimar, Lady Augusta Katherine Gordon-Lennox (1851) * Pierre Napoléon Bonaparte and Éléonore-Justine Ruflin (1852) * Prince Albert of Prussia (1809–1872), Prince Albert of Prussia and Rosalie von Rauch (1853) * Prince William of Hesse-Philippsthal-Barchfeld and Maria von Hanau-Hořowitz (1857) * Duke Ludwig Wilhelm in Bavaria (1831–1920), Duke Ludwig Wilhelm in Bavaria and Henriette Mendel (1859) * Prince Victor of Hohenlohe-Langenburg and Princess Victor of Hohenlohe-Langenburg, Laura Williamina Seymour (1861) * Prince Leopold of Saxe-Coburg and Gotha and Constanze Geiger (1861) * Prince Frederick of Schleswig-Holstein-Sonderburg-Augustenburg and Mary von Waldersee, Mary Esther Lee (1864) * Louis III, Grand Duke of Hesse and Anna Magdalena Appel (1868) * Grand Duke Alexei Alexandrovich of Russia and Alexandra Zhukovskaya (1868) * Ferdinand II of Portugal and Elise, Countess of Edla, Elise Friederike Hensler (1869) * Victor Emmanuel II and Rosa Vercellana (1869) * Georg II, Duke of Saxe-Meiningen and Ellen Franz (1873) * Alexander II of Russia and Catherine Dolgorukova (1880) * Grand Duke Michael Mikhailovich of Russia and Countess Sophie of Merenberg (1891) * Duke Ludwig Wilhelm in Bavaria (1831–1920), Duke Ludwig Wilhelm in Bavaria and Antonie Barth (1892) * Archduke Franz Ferdinand of Austria and Sophie, Duchess of Hohenberg, Countess Sophie Chotek von Chotkova und Wognin (1900) * Grand Duke Paul Alexandrovich of Russia and Princess Olga Paley, Olga Karnovich (1902) * Prince Bernhard of Lippe (1872–1934), Prince Bernhard of Lippe and Armgard von Cramm (1909) * Leopold II of Belgium and Caroline Lacroix (1909) * Princess Tatiana Constantinovna of Russia and Konstantine Bagration of Mukhrani (1889–1915), Konstantine Bagration of Mukhrani (1911) * Prince Victor of Thurn and Taxis and Princess Lida of Thurn and Taxis, Lida Eleanor Nicolls (1911) * Grand Duke Michael Alexandrovich of Russia and Natalia Brasova (1912) * Princess Irina Alexandrovna of Russia and Felix Yusupov (1914) * Prince Oskar of Prussia and Countess Ina Marie von Bassewitz (1914) * Grand Duchess Olga Alexandrovna of Russia and Nikolai Kulikovsky (1916) * Alexander of Greece and Aspasia Manos (1919) * Infanta Beatriz of Spain and Alessandro Torlonia, 5th Prince of Civitella-Cesi (1935) * Leopold III of Belgium and Lilian, Princess of Réthy, Mary Lilian Baels (1941) * Prince Michael of Greece and Denmark and Marina Karella (1965)


Inbreeding

Over time, because of the relatively limited number of potential consorts, the gene pool of many ruling families grew progressively smaller, until all European royalty was related. This also resulted in many being descended from a certain person through many lines of descent, such as the numerous European Royal descendants of Queen Victoria and King Christian IX, royalty descended from Queen Victoria, Queen Victoria of the United Kingdom or Christian IX of Denmark, King Christian IX of Denmark. As a result, royal intermarriages became consanguine marriages, which lead to both new health issues arising and existing ones being compounded. Examples of incestuous marriages and the impact of inbreeding on royal families include: * Most rulers of the Ptolemaic dynasty from Ptolemy II were married to their brothers and sisters, in order to keep the Ptolemaic blood "pure" and to strengthen the line of succession. Cleopatra, Cleopatra VII (also called Cleopatra VI) and Ptolemy XIII, who married and became co-rulers of ancient Egypt following their father's death, are the most widely known example. * King Tutankhamun's father and mother were related. * The Persian Sassanian dynasty often married close blood relatives, partially for religious reasons (see xwedodah). One example would be Narseh, who married his sister Shapurdukhtak of Sakastan, Shapuhrdukhtag. * Four Japanese Emperors married their sisters: namely Emperor Bidatsu, Emperor Yōmei, Emperor Kanmu, and Emperor Junna. * Jean V of Armagnac was said to have formed a rare brother-sister liaison,Guyenne, p.45 left descendants and claimed to be married. There is no evidence that this "marriage" was contracted for dynastic rather than personal reasons. * The House of Habsburg frequently practiced consanguine marriages as a way of consolidating the dynasty's political power, with both first cousin and uncle–niece pairings common. The most visible consequence of this was an extended lower chin (Habsburg chin, mandibular prognathism), which was typical for many Habsburg relatives over a period of six centuries; the jaw deformity is so closely associated with the family that it is commonly known as the "Habsburg jaw" or "Habsburg lip". The Spanish branch took this practice to an extreme: of the eleven marriages contracted by Spanish monarchs between 1450 and 1661, nine contained some element of consanguinity. The last of the Spanish line, Charles II of Spain, Charles II—who was severely disabled from birth and possibly impotent— possessed a genome comparable to that of a child born to a brother and sister. * The House of Wittelsbach suffered from several cases of mental illness, often attributed to their frequent intermarriages. Several family members suffered from mental and physical illnesses, as well as epilepsy.Owens, p.41


See also

* Haemophilia in European royalty * Global royal intermarriage


Notes


References and sources


References


Sources

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