War of succession

A war of succession is a war prompted by a succession crisis in which two or more individuals claim the right of successor to a deceased or deposed monarch. The rivals are typically supported by factions within the royal court. Foreign powers sometimes intervene, allying themselves with a faction. This may widen the war into one between those powers.

Wars of succession were some of the most prevalent types of wars by cause throughout human history, but the replacement of absolute monarchies by an international order based on democracy with constitutional monarchies or republics ended almost all such wars by 1900.

Terminology

Descriptions

In historiography and literature, a ''war of succession'' may also be referred to as a ''succession dispute'', ''dynastic struggle'', '' internecine conflict'', ''fratricidal war'', or any combination of these terms. Not all of these are necessarily describing armed conflict, however, and the dispute may be resolved without escalating into open warfare. Wars of succession are also often referred to as a ''civil'' war, when in fact it was a conflict within the royalty, or broader aristocracy, that civilians were dragged into. It depends on the circumstances whether a war of succession is also a ''civil'' war in the sense of ''intra''state war (if it is limited to armed conflict inside one state), or it may be an ''inter''state war (if foreign powers intervene; sometimes called 'international' war), or both. Therefore, names or descriptions of a war may simply depend on one's perspective; for example, Nolan (2008) stated: 'The Williamite War of 1689–1691, sometimes known as the Jacobite War, was a war of succession in England and an international war for or against France for most non-Irish participants. But it was a civil war in Ireland.' Similarly, scholars sometimes disagree whether the 1657–1661 Mughal dynastic conflict (which consisted of several subconflicts, phases, and factions) should be labelled a 'war of succession' or a ' (princely) rebellion'.

Orders of succession

There are several different types of orders of succession, some of which may not have been enshrined in law, but only established in local custom or tradition. Across times and places, orders of succession have switched from one system to another. Some prominent examples are:
* ''None:'' Every death of a monarch results in a succession crisis that is resolved ''ad hoc'', either diplomatically or by violence. This pattern has been observed in cultures around the world, for example in the Buyid dynasty (934–1062), Đại Cồ Việt (968–1054), Ayutthaya (17th century), and Mataram (17th–18th century).
* ''Heir designation'' or ''selection:'' The reigning monarch had the sole right to personally designate his or her preferred heir while still alive, sometimes far ahead of time (perhaps already giving them important functions and dignities), sometimes only in their last will or verbally on their deathbed. This pattern has been observed in cultures around the world. For example, from Peter the Great (1721) to the Pauline Laws (1797), the Russian Empire had this system. It was also common in high medieval Mediterranean Europe to accept heir designation by will.
** ''Co-rulership'' or ''abdication/delegation'': In many states in cultures around the world, the reigning monarch gave their designated heir already a prominent role in running the realm to prevent a power vacuum upon the monarch's death, and to train the co-ruler in their future duties. The Roman Tetrarchy had two ''Augusti'' (senior emperors) and two ''Caesari'' (junior emperors, chosen by the ''Augusti''). The Capetian kings France had their sons elected 'co-king' by his noblemen to ensure loyalty to the heir. The Han dynasty set up an Office of the Crown Prince wherein a group of officials trained and served the heir designate long ahead of the succession. In the Vietnamese Trần dynasty, the kings ' bdicatedthe throne to their chosen adult heirs upon the death of their predecessors, thereafter ruling as 'senior' kings.'
* ''Equal share within the lineage'' or ''dividing the inheritance'': One son of the monarch would inherit the kingship while other sons (or other male relatives) would be given an equal share / regional control of the territory. This was common practice in Francia, and prevailed in certain regions in northern and western France such as Normandy long after the French royal dynasty had adopted primogeniture.
* ''Agnatic seniority'', ''collateral succession'', ''horizontal succession'', ''fraternal succession'' or ''brother–brother succession:'' When monarch X dies, his oldest brother succeeds him, and then his second-oldest brother and so on, until there are no brothers left; then, the oldest son of monarch X becomes the next monarch, and then monarch X's second-oldest son, and so on. This pattern has been observed in cultures around the world, including in many European states before the 11th century such as Piast dynasty of Poland, and the Rurik dynasty of the Kyivan Rus' and its successor states), African states such as the Kanem–Bornu Empire from the 14th century onwards, or Asian states such as the Konbaung dynasty of Burma.
* ''Patrilineal succession'', ''vertical succession'', ''filial succession'' or ''father–son succession'': A son of the previous monarch succeeds him. There are several different subtypes of this order of succession, including:
** ''Primogeniture'': The oldest son of the previous monarch succeeds him; in case there is no son, then his eldest daughter succeeds. This system is virtually unique to Europe, and has only been adopted in very few other states in modern times.
*** Salic law: Only males can inherit the kingship.
*** semi-Salic law: Inheritance may pass through the female line but only at the extinction of all male lines.
*** ''Absolute primogeniture'', gender is irrelevant and the oldest child of the last monarch automatically becomes the next ruler.
** ''Ultimogeniture'': The youngest son of the previous monarch succeeds him. This system existed in some places in medieval Europe.
** ''Non-fixed son'': There is no fixed rule which son of the previous monarch should automatically succeed him. Any son may be designated as heir by the living monarch, or be accepted by the relevant aristocrats after asserting himself through diplomacy or violence over his brothers. Examples include the Kanem–Bornu Empire until the 14th century, and Anglo-Saxon England.
* ''Elective succession'': see elective monarchy. The royal succession is decided by votes from a relatively small group of aristocrats (typically a few dozen). It may be decided by an election ''vivente rege'' ("while the king yet lives") to secure a more stable transition of power upon the monarch's death, although this was not required, and could still result in a war of succession.

Analysis

Common elements

A war of succession is a type of war concerning struggle for the throne: a conflict about supreme power in a monarchy. Although it is typically associated with hereditary monarchy (either with primogeniture or some other principle of hereditary succession), the concept has also been applied to elective monarchies. It may be intrastate war, an interstate war (if foreign powers intervene), or both.

A succession war may arise after (or sometimes even before) a universally recognised ruler over a certain territory passes away (sometimes without leaving behind any (legal) offspring, or failing to clearly designate an heir), or is declared insane or otherwise incapable to govern, and is deposed. Next, several pretenders (also known as 'claimants', 'candidates', or 'rivals') step forward, who are either related to the previous ruler (by ancestry or marriage) and therefore claim to have a right to their possessions based on the hereditary principle, or have concluded a treaty to that effect. They will seek allies within the nobility and/or abroad to support their claims to the throne. After all options for a diplomatic solution –such as a sharing of power, or a financial deal– or a quick elimination (in effect a coup d'état) –e.g. by assassination or arrest– have been exhausted, a military confrontation will follow. Quite often such succession disputes have led to long-lasting wars. Potential candidates were not always limited to members from the royal household; depending on circumstances, aristocrats of other noble families within the realm were eligible to replace the deceased monarch, and could seize the opportunity of a succession crisis to take control of the state and found a new dynasty.

Factors that increased the risk of a succession crisis included lack of legitimate heirs (especially when the (ruling branch of a) dynasty died out), illegitimate children, contested inheritance, and the creation of collateral dynastic branches. The last factor in particular had the potential to not only stimulate wars of succession upon a monarch's death, but also princely revolts by cadets and cousins while they were still alive. The minority of a ruler necessitated regents and ministers to run state affairs until they came of age, which made opposition from military and administrative elites to the underage monarch easier, and also increased the risk of widespread political instability and civil conflict.

Some wars of succession are about women's right to inherit. This does not exist in some countries (a "sword fief", where the Salic law applies, for example), but it does in others (a "spindle fief"). Often a ruler who has no sons, but does have one or more daughters, will try to change the succession laws so that a daughter can succeed him. Such amendments will then be declared invalid by opponents, invoking the local tradition. In Europe, the Holy Roman Emperor (or King of the Romans) increasingly regularly granted smaller inland fiefs to heirs according to the female lineage since the 13th century. The Privilegium Minus of 1156, which established the Duchy of Austria, already allowed women to inherit the state as well.

Prevalence and impact

Land inheritance disputes were frequent in agrarian societies, and the 'increasing subdivision of estates was a common cause of the undermining of territorial aristocracies' in cultures across the world. For example, in the 10th and 11th centuries, Sassanid Persia, various states in India, the Song dynasty of China, and medieval Europe, all struggled with succession crises. According to British statesman Henry Brougham (Lord Chancellor 1830–34), there were more and longer wars of succession in Europe between 1066 and the French Revolution (1789–99) than all other wars put together. "A war of succession is the most lasting of wars. The hereditary principle keeps it in perpetual life – hereasa war of election is always short, and never revives", he opined, arguing for elective monarchy to solve the problem. According to Kalevi Holsti (1991, p. 308, Table 12.2), who catalogued and categorised wars from 1648 to 1989 into 24 categories of 'issues that generated wars', 'dynastic/succession claims' were (one of) the primary cause(s) of 14% of all wars during 1648–1714, 9% during 1715–1814, 3% during 1815–1914, and 0% during 1918–1941 and 1945–1989. Braumoeller (2019) attributed this drastic decrease (and practical extinction) of wars of succession from the 18th century onwards largely to the fact that 'succession no longer serves either to cement territorial holdings legitimized by continuous bloodlines or to create de facto alliances or long-standing allegiances among the Great Powers.' He added that 'an international order based on political democracy more or less eliminates the incentive for wars of royal succession.'

Wars of succession have throughout history often been the worst-case scenario for absolute monarchies and other autocracies, as they are commonly known to be at their weakest and most vulnerable when the ruler dies and it is uncertain who will be the successor. Rival claims to ultimate power within such a regime are very prone to spiralling out of control into violence, because such regimes operate according to rule by force, or might makes right. A succession crisis not only risks dragging the entire population into 'civil' war between factions backing rival pretenders, but the power vacuum it creates also presents oppressed groups within the state with an opportunity to revolt, as well as vassal states outside it to reclaim their independence, and while the state is weakened, it also provides rulers of neighbouring states the chance to invade to further their own interests (with or without their own claim to the throne, or while backing another claimant within the state). In numerous cases, the enormous long-term political and economic instability created by wars of succession caused the fall of the dynasty or the state, or both.

Scholars such as Johannes Kunisch and Johannes Burckhardt (1997) blamed wars of succession in early modern Europe on notions such as the divine right of kings and absolutism, because they created inherent problems in 'a state system that had known neither effective forms of cooperation nor a clear hierarchy that had neither experienced a formal equality between its members nor clear borders.' Nolan (2008) added about the 1650–1715 period in Europe: 'Complex issues of succession of Bourbon and Habsburg were the daily stuff of high European politics at all times, and the bane of the lives of the masses of peasants swept away by ebbing and waning tides of peace and the maelstrom of war.' To him, the Nine Years' War and (1688–1697) and War of the Spanish Succession (1701–1714) were the 'two great, climactic conflicts that submerged local conflicts', so that these decades produced 'a generation of war that swirled around the dynastic ambitions and personal convictions of Louis XIV.'

Prevention and mitigation

Throughout the centuries and across the planet, various attempts have been made at prevention or mitigation of wars of succession.
* Legally fixing the order of succession (see also Orders of succession above): All over Europe (except in the Kyivan Rus'), the introduction of primogeniture from the 11th to 13th century sought to establish a fixed order of succession, but it proved to be insufficient to prevent numerous succession crises and wars, as demonstrated by their persistence into the 19th century. Kokkonen and Sundell (2017) found that in Europe during 1000–1799, successions following monarchs' natural deaths considerably increased the risk of both intrastate ('civil') as well as interstate wars of succession; they calculated that monarchies practicing primogeniture did experience fewer intrastate wars than elective monarchies, but 'there is no evidence that primogeniture moderated successions' effects on interstate wars.' Luard (1992) and Duchchardt (1997) pointed out that additional diplomatic efforts such as 'offensive and defensive alliances, dynastic marriages and agreements on succession' often failed to prevent them either, although Nolan (2008) countered that the Act of Settlement 1701 (alias Act of Succession) did avoid 'another violent succession crisis upon Queen Anne's eventual death.' Modern scholars are still divided on the question whether hereditary succession (as opposed to other methods of appointing leaders) has historically been a net force for political stability, including Kokkonen and Sundell (2014), or instability, such as Steven Pinker (2011), who stated: 'The idea of basing leadership on inheritance is a recipe for endless wars of succession'. Some thinkers of the latter opinion go as far back as Thomas Paine in his pamphlet ''Common Sense'' (1776), in which his argument in favour of the American colonies in revolt against the British crown becoming a republic rather than a monarchy included his claim that hereditary succession more often than not led to civil wars.
* Dividing the inheritance: A common strategy in states such as Francia and the Timurid Empire was to share the inheritance amongst male family members by giving them regional control over the realm's territory in order to appease them. One would still be the supreme ruler, while the other heirs would receive appanages and could establish cadet branches. Any landholdings and titles of princely branches that died out could be retaken by the dynasty's ruling branch. However, this division of the inheritance also granted many princes a power base from which to challenge the reigning monarch.
* Abdication/delegation in favour of designated heir: Abdication of a living monarch in favour of one or more heirs was one strategy to attempt to secure a smooth transition of power. For example, Charles V, Holy Roman Emperor abdicated in 1556 and divided his possessions between his son Philip II of Spain and his brother Ferdinand I, Holy Roman Emperor before dying in 1558, splitting the House of Habsburg in a Spanish and an Austrian branch. A related strategy was a partial or gradual abdication in which the ruling monarch already delegated some of their powers to their designated heir before retiring from active politics or dying. An example is how Cosimo I de' Medici effectively retired from governing in the 1560s in favour of his son and designated successor Francesco before dying in 1574.
* Eliminating potential opponents beforehand: A common set of strategies to secure one's own succession or accession or that of someone else before a war could break out was to eliminate potential rivals early on in the succession crisis, or before there even was a succession crisis. This could range from assassination to banishment, and from bodily mutilation to imprisonment. Political mutilation in Byzantine culture was one way in which rivals sought to prevent each other from staging coups d'état or wars of succession to gain the Byzantine Emperorship, either before they had the chance, or to punish them after failed attempts and to prevent future attempts. Similar mutilation of competitors for succession were also common elsewhere in Europe, such as William fitz Giroie in 11th-century Normandy. In the Ottoman Empire, succession practices against potential rival claimants ranged from committing royal fratricide to lifelong imprisonment in the Kafes. None of its succession procedures were codified, however.
* Hiding the monarch's death and secretly seizing power: An ''ad hoc'' strategy that a candidate or an important player supporting a candidate might have is to try and hide the monarch's death for some time to undertake the necessary actions to secretly seize power and confront any potential rival pretenders with a ''fait accompli''. This can only be done effectively if one can control the flow of information about the monarch's death from potential rivals. Even if a war erupts, whoever seizes control over critical government institutions (such as the court and the army) first, and secures the support of domestic and foreign powers at the start, puts their enemy/enemies at a major disadvantage.

Applicability

It can sometimes be difficult to determine whether a war was purely or primarily a war of succession, or that other interests were at play as well that shaped the conflict in an equally or more important manner, such territory, economy, religion, and so on. Many wars are not called 'war of succession' because hereditary succession was not the most important element, or despite the fact that it (partially) ''was''. For example, the Great Northern War (1700–1721) was primarily about territory, but during 1704–1706, it was focused on the royal succession in Poland. Similarly, wars can also be unjustly branded a 'war of succession' whilst the succession was actually not the most important issue hanging in the balance, such as when Louis XIV used dubious succession claims as an excuse to declare the War of Devolution (1667–1668) that he rather sought to fight for territorial gain. Some wars of succession were about multiple simultaneous disputes, such as in the cases of the Nine Years' War (about England, the Palatinate, and Cologne) and the War of the Polish Succession (about Poland and Lorraine). The outbreak of a war can be motivated by a succession dispute, but its focus or scope can shift over its course, and vice versa, particularly if a new succession crisis erupts in the middle of a war that originally began for different reasons (e.g. the Russo-Swedish War (1741–1743)).

Patterns by continent

African patterns

According to Catherine Coquery-Vidrovitch (1988), wars of succession were 'so common in the history of African monarchies that is seems almost an institution'. Especially in matrilinear societies, there were few succession laws or fixed customs. 'Dynastic histories are everywhere intersected with wars of succession (the almost exclusive cause of civil wars), and royal genealogies are very hard to reconstruct', with many 'unfortunate heirs-presumptive more or less violently prevented from assuming office'.

Changing orders of succession

In various African cultures, the order of succession has changed over the course of centuries from one type to another, and especially during a switch there were several wars of succession before the new system was consolidated. For example, the death of mai Idris I Nigalemi (c. 1370) of the Kanem–Bornu Empire triggered a war of succession, because it was unclear whether collateral (brother to brother) or filial/patrilineal (father to son) succession was to be preferred; patrilineal had been dominant until early 14th-century Kanem–Bornu, but was replaced by collateral by 1400. The '' Kano Chronicle'' records father–son succession in the Kingdom of Kano, but always mentions the name of the ruler's mother, which may point to vestiges of a preceding matrilineal system. The Kingdom of Yatenga switched from collateral to filial succession in the late 18th century.

Bunyoro

Several Bunyoro wars of succession took place in the East African Empire of Kitara in the 17th and 18th century. The last recorded two occurred around 1851 and 1869. Every death of a ''mukama'' ("king") of Kitara created a power vacuum, during which all legitimate royal candidates were required to negotiate to agree on a single candidate to become the next ruler. In cases of failure, 'traditions encouraged them to mobilize their supporters and engage in a brief and decisive political violence to win the vacant seat.' Using such political violence was an institutionalised legitimate procedure to end the royal power vacuum, but sometimes the rivals did not manage defeat each other quickly as custom demanded. Lengthy wars of succession often broke down society with large-scale famines, massacres and refugee crises, endangering the state's continued existence. They also almost always coincided with rebellions in its tributary states, indicating that vassals regularly sought to exploit their suzerain's weakness during succession disputes in order to reclaim independence.

Americas patterns

In Andean civilizations such as the Inca Empire (1438–1533), it was customary for a lord to pass on his reign to the son he perceived to be the most able, not necessarily his oldest son; sometimes he chose a brother instead. After the Spanish colonization of the Americas began in 1492, some Andean lords began to assert their eldest-born sons were the only 'legitimate' heirs (as was common to European primogeniture customs), while others maintained Andean succession customs involving the co-regency of a younger son of a sitting ruler during the latter's lifetime, each whenever the circumstances favoured either approach.

Asian patterns

Burma

Helen James (2004) stated that in the late 17th-century Burmese Restored Toungoo dynasty 'the transfer of power upon the death of a monarch was always a problem, for there were many contenders to the throne owing to the practice of polygamy. The sons of the major queens frequently contested the succession.' Alaungpaya, founder of the new Konbaung dynasty (1752–1885), intended his successors to be appointed by agnatic seniority (from brother to brother), according to James in an attempt 'to avoid the bloodshed that accompanied each transfer of power at the death of a Burmese monarch. It was a vain hope. The directive itself led to bloody succession crises, as some of his sons sought to pass the crown to their sons instead of their brothers, thereby thwarting Alaungpaya's dying wish.' His oldest son Naungdawgyi had to fight a two-year war of succession (1760–1762) to assert his authority. Hsinbyushin's succession was not challenged, but designating his son Singu Min as heir rather than a younger brother bred an imminent succession dispute just before his death. The next king Singu managed to avoid a war of succession by having most of his potential rivals killed or exiled in a timely manner, although Singu's reign was cut short by a princely rebellion in February 1782, in which Phaungkaza Maung Maung seized the throne for seven days before Bodawpaya killed and replaced him. Bodawpaya successfully eliminated all his rivals upon enthronement, and in 1802 ended 'twenty-five years of conflict between lineal and collateral succession' in favour of the former, according to Koenig (1990). Nevertheless, two kings were overthrown by their brothers in coups in 1837 and 1853, and in 1866 the crown prince (the king's brother) was assassinated by two of the king's sons. When the last Burmese king Thibaw Min (r. 1878–1885) began his reign, he had about 80 of his relatives murdered to prevent any challenge to his accession.

China

According to Arthur Waldron (2008), 'throughout their history, Chinese states have been overwhelmingly land-based and (...) their wars have chiefly been wars of succession and overland conquest.' In the alleged first dynasty, the Xia, as well as the confirmed Shang dynasty, both father–son and older brother–younger brother succession appear to have existed, with agnatic primogeniture gradually becoming a frequent practice in the late Shang. The Rebellion of the Three Guards (c. 1042–1039 BCE) after the death of King Wu of Zhou is perhaps the first war of succession in Chinese recorded history. During the reign of Duke Zhuang, Zheng was the most powerful Spring and Autumn period state, but the 701–680 BCE war of succession following his death reduced it to one of the weakest. As the authority of the Zhou dynasty declined, the states' power increased (the Age of Hegemons), and whenever the Zhou royal clan was unable to solve a succession crisis by itself, leading states were expected to militarily intervene on behalf of the "legitimate" heir, which occurred frequently in the 7th and 6th century. However, as the states grew more powerful and dukes had to delegate control over certain areas to kinsmen as their territories enlarged, they increasingly risked internal dynastic struggles as well. Especially the largest states experienced this problem, namely Qi (e.g. the War of Qi's succession in 643–642 BCE) and Jin; in the latter case, this eventually led to the Partition of Jin in 403 BCE, which ushered in the Warring States period.

After uniting all states into his Qin dynasty, the first Chinese emperor Qin Shi Huang failed to establish secure succession rules before his death in 210 BCE, upon which his clan immediately lost control of the government to Li Si and Zhao Gao, and his dynasty fell soon after (207 BCE). Winning the subsequent Chu–Han Contention and founding the Han dynasty, Emperor Gaozu sought to ensure a stable succession process that would not endanger the dynasty. He strengthened the designated heir's position by creating the office of the Crown Prince, in which a group of officials educated and served the designated heir well in advance until his time to succeed would arrive. This crown prince system prevented a lot of succession disputes during the Han dynasty, and although it frequently malfunctioned in the Three Kingdoms, Jin and Northern and Southern dynasties periods, it 'matured' during the Tang and Song dynasties. Nevertheless, the Han state did suffer dynastic instability several times. When a Han emperor died without officially appointing a successor, his widow, the empress dowager, had the sole right to appoint one of the late emperor's surviving sons or relatives to the position. At such times, or when an infant emperor was placed on the Han throne, a regent, often also the empress dowager or one of her male relatives, would assume the duties of the emperor until he reached his majority. Sometimes the empress dowager's faction—the consort clan—was overthrown in a coup d'état or a war of succession. For example, Empress Lü Zhi was the ''de facto'' ruler of the court during the reigns of the child emperors Qianshao (''r''. 188–184 BCE) and Houshao (''r''. 184–180 BCE), but her faction was overthrown during the Lü Clan Disturbance upon her death in 180 BCE, and Liu Heng was named emperor instead.

At the end of the Han dynasty in the 190s, the imperial Liu family lost effective control over the state; prominent members of the nobility became warlords trying to establish their own dynasties. Instead of governors being appointed by the emperor, they tried to secure the succession of their own clansmen, making it a hereditary office that led to several succession crises. The Yuan clan, once a prominent candidate to replace the imperial Liu family, descended into a fratricidal war upon Yuan Shao's death (202–205). The August 208 death of Liu Biao caused a succession dispute between his sons Liu Cong and Liu Qi, but a quick invasion by Cao Cao forced Cong to surrender without a fight while Qi fled. Cao Pi's deposition of the last Han emperor Xian and foundation of the Wei dynasty in 220 caused Liu Bei, a scion of the imperial family, to proclaim himself the legitimate emperor and found the Shu Han

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