__NOTOC__ Year 840 ( DCCCXL) was a

leap year starting on Thursday A leap year starting on Thursday is any year with 366 days (i.e. it includes 29 February) that begins on Thursday 1 January, and ends on Friday 31 December. Its dominical letters hence are DC. The most recent year of such kind was 2004, and the n ...

in the

Julian calendar The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts ...

, the 840th year of the

Common Era Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. Common Era and Before the Common Era are alternatives to the ...

(CE) and

Anno Domini The terms (AD) and before Christ (BC) are used when designating years in the Gregorian calendar, Gregorian and Julian calendar, Julian calendars. The term is Medieval Latin and means "in the year of the Lord" but is often presented using "o ...

(AD) designations, the 840th year of the

1st millennium File:1st millennium montage.png, From top left, clockwise: Depiction of Jesus, the central figure in Christianity; The Colosseum, a landmark of the once-mighty Roman Empire; Kaaba, the Great Mosque of Mecca, the holiest site of Islam; Chess, a new ...

, the 40th year of the 9th century, and the 1st year of the

840s The 840s decade ran from January 1, 840, to December 31, 849. Significant people * Al-Mu'tasim * Al-Wathiq * Alfred the Great * Louis the Pious * Charles the Bald * Ermentrude of Orléans * Louis the Stammerer * Louis the German * Lothair I ...

decade.

Events

By place

Europe

June 20 Events Pre-1600 * 451 – Battle of Chalons: Flavius Aetius battles Attila the Hun. After the battle, which was inconclusive, Attila retreats, causing the Romans to interpret it as a victory. * 1180 – First Battle of Uji, startin ...

– Emperor

Louis the Pious Louis the Pious (; ; ; 16 April 778 – 20 June 840), also called the Fair and the Debonaire, was King of the Franks and Holy Roman Emperor, co-emperor with his father, Charlemagne, from 813. He was also King of Aquitaine from 781. As the only ...

falls ill and dies at his hunting lodge, on an island in the

Rhine The Rhine ( ) is one of the List of rivers of Europe, major rivers in Europe. The river begins in the Swiss canton of Graubünden in the southeastern Swiss Alps. It forms part of the Swiss-Liechtenstein border, then part of the Austria–Swit ...

, near his imperial palace at

Ingelheim Ingelheim (), officially Ingelheim am Rhein (), is a town in the Mainz-Bingen Districts of Germany, district in the Rhineland-Palatinate state of Germany. The town sprawls along the Rhine's left bank. It has been Mainz-Bingen's district seat sin ...

, while suppressing a revolt. His eldest son

Lothair I Lothair I (9th. C. Frankish: ''Ludher'' and Medieval Latin: ''Lodharius''; Dutch and Medieval Latin: ''Lotharius''; German: ''Lothar''; French: ''Lothaire''; Italian: ''Lotario''; 795 – 29 September 855) was a 9th-century emperor of the ...

succeeds him as

Holy Roman Emperor The Holy Roman Emperor, originally and officially the Emperor of the Romans (disambiguation), Emperor of the Romans (; ) during the Middle Ages, and also known as the Roman-German Emperor since the early modern period (; ), was the ruler and h ...

, and tries to seize all the territories of the late

Charlemagne Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...

Charles the Bald Charles the Bald (; 13 June 823 – 6 October 877), also known as CharlesII, was a 9th-century king of West Francia (843–877), King of Italy (875–877) and emperor of the Carolingian Empire (875–877). After a series of civil wars during t ...

, 17, becomes king of the

Franks file:Frankish arms.JPG, Aristocratic Frankish burial items from the Merovingian dynasty The Franks ( or ; ; ) were originally a group of Germanic peoples who lived near the Rhine river, Rhine-river military border of Germania Inferior, which wa ...

, and joins with his half-brother

Louis the German Louis the German (German language, German: ''Ludwig der Deutsche''; c. 806/810 – 28 August 876), also known as Louis II of Germany (German language, German: ''Ludwig II. von Deutschland''), was the first king of East Francia, and ruled from 8 ...

, in resisting Lothair. *

Vikings Vikings were seafaring people originally from Scandinavia (present-day Denmark, Norway, and Sweden), who from the late 8th to the late 11th centuries raided, pirated, traded, and settled throughout parts of Europe.Roesdahl, pp. 9� ...

from

Norway Norway, officially the Kingdom of Norway, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of the Kingdom of ...

capture

Dublin Dublin is the capital and largest city of Republic of Ireland, Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the Provinces of Ireland, province of Leinster, and is bordered on the south by the Dublin Mountains, pa ...

, and establish a Norse kingdom in

Ireland Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially Names of the Irish state, named Irelan ...

Britain

* King Wigstan of Mercia, grandson of former ruler Wiglaf (see

839 __NOTOC__ Year 839 ( DCCCXXXIX) was a common year starting on Wednesday of the Julian calendar. Events By place Europe * Prince Sicard of Benevento is assassinated by a conspiracy among the nobility. He is succeeded by Radelchis I, c ...

), declines his kingship in preference of the religious life. He asks his widowed mother, Princess

Ælfflæd Ælfflæd is a name of Anglo-Saxon England meaning Ælf (Elf) and flæd (beauty). It may refer to: * Saint Ælfflæd of Whitby (654–714) * Ælfflæd of Mercia, daughter of Offa, wife of King Æthelred I of Northumbria * Ælfflæd, wife of Edwa ...

, to act as

regent In a monarchy, a regent () is a person appointed to govern a state because the actual monarch is a minor, absent, incapacitated or unable to discharge their powers and duties, or the throne is vacant and a new monarch has not yet been dete ...

. A

nobleman Nobility is a social class found in many societies that have an aristocracy. It is normally appointed by and ranked immediately below royalty. Nobility has often been an estate of the realm with many exclusive functions and characteristics. T ...

of the line of the late king Beornred, named Berhtric, wishes to marry her but he is a relative. Wigstan refuses the match, and is murdered by followers of Berhtric at Wistow. He is buried at Repton Abbey, and later revered as a

saint In Christianity, Christian belief, a saint is a person who is recognized as having an exceptional degree of sanctification in Christianity, holiness, imitation of God, likeness, or closeness to God in Christianity, God. However, the use of the ...

. The

Mercia Mercia (, was one of the principal kingdoms founded at the end of Sub-Roman Britain; the area was settled by Anglo-Saxons in an era called the Heptarchy. It was centred on the River Trent and its tributaries, in a region now known as the Midlan ...

n throne is seized by Berhtric's father,

Beorhtwulf Beorhtwulf (, meaning "bright wolf"; also spelled ''Berhtwulf''; died 852) was King of Mercia, a kingdom of Anglo-Saxon England, from 839 or 840 to 852. His ancestry is unknown, though he may have been connected to Beornwulf, who ruled Mercia in ...

.Zaluckyj & Zaluckyj, "Decline" *

make permanent settlements with their first ' wintering over', located at

Lough Neagh Lough Neagh ( ; ) is a freshwater lake in Northern Ireland and is the largest lake on the island of Ireland and in the British Isles. It has a surface area of and is about long and wide. According to Northern Ireland Water, it supplies 4 ...

Northern Ireland Northern Ireland ( ; ) is a Countries of the United Kingdom, part of the United Kingdom in the north-east of the island of Ireland. It has been #Descriptions, variously described as a country, province or region. Northern Ireland shares Repub ...

(approximate date).

Asia

* Emperor Wenzong (Li Ang) dies after a 13-year reign, in which he has failed to break the power of his palace

eunuch A eunuch ( , ) is a male who has been castration, castrated. Throughout history, castration often served a specific social function. The earliest records for intentional castration to produce eunuchs are from the Sumerian city of Lagash in the 2 ...

s. He is succeeded by his brother Wu Zong, as Chinese ruler of the

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 ...

. * The Yenisei Kirghiz settle along the

Yenisei River The Yenisey or Yenisei ( ; , ) is the list of rivers by length, fifth-longest river system in the world, and the largest to drain into the Arctic Ocean. Rising in Mungaragiyn-gol in Mongolia, it follows a northerly course through Lake Baikal a ...

, and sack with a force of around 80,000 horsemen the Uyghur capital, Ordu-Baliq (driving the

Uyghurs The Uyghurs,. alternatively spelled Uighurs, Uygurs or Uigurs, are a Turkic peoples, Turkic ethnic group originating from and culturally affiliated with the general region of Central Asia and East Asia. The Uyghurs are recognized as the ti ...

out of

Mongolia Mongolia is a landlocked country in East Asia, bordered by Russia to the north and China to the south and southeast. It covers an area of , with a population of 3.5 million, making it the world's List of countries and dependencies by po ...

). This ends the

Uyghur Khaganate The Uyghur Khaganate (also Uyghur Empire or Uighur Khaganate, self defined as Toquz-Oghuz country; , Tang-era names, with modern Hanyu Pinyin: or ) was a Turkic empire that existed for about a century between the mid 8th and 9th centuries. It ...

.History of Central Asia
*The 840 Erzurum earthquake takes place in the city of Qaliqala (modern

Erzurum Erzurum (; ) is a List of cities in Turkey, city in eastern Anatolia, Turkey. It is the largest city and capital of Erzurum Province and is 1,900 meters (6,233 feet) above sea level. Erzurum had a population of 367,250 in 2010. It is the site of an ...

).Guidoboni, Traina, 1995, p. 121

By topic

Religion

* Nobis becomes

bishop A bishop is an ordained member of the clergy who is entrusted with a position of Episcopal polity, authority and oversight in a religious institution. In Christianity, bishops are normally responsible for the governance and administration of di ...

of St. David's, in the Welsh

Kingdom of Dyfed The Kingdom of Dyfed (), one of several Welsh petty kingdoms that emerged in 5th-century sub-Roman Britain in southwest Wales, was based on the former territory of the Demetae (modern Welsh ''Dyfed''). The royal line was founded by Irish ...

(approximate date).

Births

January January is the first month of the year in the Julian calendar, Julian and Gregorian calendars. Its length is 31 days. The first day of the month is known as New Year's Day. It is, on average, the coldest month of the year within most of the No ...

–

Michael III Michael III (; 9/10 January 840 – 24 September 867), also known as Michael the Drunkard, was Byzantine emperor from 842 to 867. Michael III was the third and traditionally last member of the Amorian dynasty, Amorian (or Phrygian) dynasty. He ...

, Byzantine emperor ( 867) This date of birth is generally held as uncertain; though January 840 is the most probable, 839 is also possible. *

October 25 Events Pre-1600 * 285 or 286 – Execution of Crispin and Crispinian, Saints Crispin and Crispinian during the reign of Diocletian, now the patron saints of leather workers, curriers, and shoemakers. * 473 – Emperor Leo I (emperor), ...

– Ya'qub ibn al-Layth al-Saffar, founder of the Saffarid dynasty ( 879) * Abu al-Hassan al-Nuri, Muslim

Sufi Sufism ( or ) is a mysticism, mystic body of religious practice found within Islam which is characterized by a focus on Islamic Tazkiyah, purification, spirituality, ritualism, and Asceticism#Islam, asceticism. Practitioners of Sufism are r ...

(approximate date) * Adalhard II, Frankish

(approximate date) *

Berengaudus Berengaudus (840–892) was a Benedictine monk, supposed author of ''Expositio super septem visiones libri Apocalypsis'', a Latin commentary on the ''Book of Revelation''. He has traditionally been assumed to be a monk of Ferrières Abbey, at the t ...

Benedictine The Benedictines, officially the Order of Saint Benedict (, abbreviated as O.S.B. or OSB), are a mainly contemplative monastic order of the Catholic Church for men and for women who follow the Rule of Saint Benedict. Initiated in 529, th ...

monk (

892 Year 892 (Roman numerals, DCCCXCII) was a leap year starting on Saturday of the Julian calendar, the 892nd year of the Common Era (CE) and Anno Domini (AD) designations, the 892nd year of the 1st millennium, the 92nd year of the 9th century, a ...

) *

Clement of Ohrid Saint Clement (or Kliment) of Ohrid ( Bulgarian, Macedonian, , ''Kliment Ohridski''; , ''Klḗmēs tē̂s Akhrídas''; ; – 916) was one of the first medieval Bulgarian saints, scholar, writer, and apostle to the Slavs. He was one of the mos ...

, Bulgarian scholar (approximate date) * Eudokia Ingerina, Byzantine empress (approximate date) * Hucbald, Frankish

music theorist Music theory is the study of theoretical frameworks for understanding the practices and possibilities of music. '' The Oxford Companion to Music'' describes three interrelated uses of the term "music theory": The first is the " rudiments", that ...

(or 850) *

Lothar I Lothair I (9th. C. Frankish language, Frankish: ''Ludher'' and Medieval Latin: ''Lodharius''; Dutch language, Dutch and Medieval Latin: ''Lotharius''; German language, German: ''Lothar''; French language, French: ''Lothaire''; Italian language, ...

, Frankish nobleman ( 880) *

Notker the Stammerer Notker the Stammerer ( – 6 April 912), Notker Balbulus, or simply Notker, was a Benedictine monk at the Abbey of Saint Gall active as a composer, poet and scholar. Described as "a significant figure in the Western Church", Notker made subst ...

, Benedictine

monk A monk (; from , ''monachos'', "single, solitary" via Latin ) is a man who is a member of a religious order and lives in a monastery. A monk usually lives his life in prayer and contemplation. The concept is ancient and can be seen in many reli ...

(approximate date) * Richardis, Frankish empress (approximate date) * Sunyer II, Frankish nobleman (approximate date) * Theodard, archbishop of

Narbonne Narbonne ( , , ; ; ; Late Latin:) is a commune in Southern France in the Occitanie region. It lies from Paris in the Aude department, of which it is a sub-prefecture. It is located about from the shores of the Mediterranean Sea and was ...

(approximate date) * Theodore II, pope of the

Catholic Church The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...

( 897) * Unruoch III, margrave of

Friuli Friuli (; ; or ; ; ) is a historical region of northeast Italy. The region is marked by its separate regional and ethnic identity predominantly tied to the Friulians, who speak the Friulian language. It comprises the major part of the autono ...

(approximate date)

Deaths

March 14 Events Pre-1600 * 1074 – Battle of Mogyoród: Dukes Géza and Ladislaus defeat their cousin Solomon, King of Hungary, forcing him to flee to Hungary's western borderland. * 1590 – Battle of Ivry: Henry of Navarre and the H ...

–

Einhard Einhard (also Eginhard or Einhart; ; 775 – 14 March 840) was a Franks, Frankish scholar and courtier. Einhard was a dedicated servant of Charlemagne and his son Louis the Pious; his main work is a biography of Charlemagne, the ''Vita Karoli M ...

, Frankish scholar * June 11 – Junna, emperor of

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

( 785) *

June 16 Events Pre-1600 * 632 – Yazdegerd III ascends the throne as king (''shah'') of the Persian Empire. He becomes the last ruler of the Sasanian dynasty (modern Iran). *1407 – Ming–Hồ War: Retired King Hồ Quý Ly and his son K ...

– Rorgon I, Frankish nobleman *

–

, ruler of the

Carolingian Empire The Carolingian Empire (800–887) was a Franks, Frankish-dominated empire in Western and Central Europe during the Early Middle Ages. It was ruled by the Carolingian dynasty, which had ruled as List of Frankish kings, kings of the Franks since ...

( 778) *

Agobard Agobard of Lyon (–840) was a Spain, Spanish-born priest and archbishop of Lyon, during the Carolingian Renaissance. The author of multiple treatises, ranging in subject matter from the Byzantine Iconoclasm, iconoclast controversy to Spanish Ado ...

, archbishop of

Lyon Lyon (Franco-Provençal: ''Liyon'') is a city in France. It is located at the confluence of the rivers Rhône and Saône, to the northwest of the French Alps, southeast of Paris, north of Marseille, southwest of Geneva, Switzerland, north ...

( 779) * Andrew II, duke of

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 ...

* Ansovinus, archbishop of

Camerino Camerino is a town in the province of Macerata, Marche, central-eastern Italy. It is located in the Apennines bordering Umbria, between the valleys of the rivers Potenza and Chienti, about from Ancona. Camerino is home to the University of Ca ...

* Czimislav, king of the

Sorbs Sorbs (; ; ; ; ; also known as Lusatians, Lusatian Serbs and Wends) are a West Slavs, West Slavic ethnic group predominantly inhabiting the parts of Lusatia located in the German states of Germany, states of Saxony and Brandenburg. Sorbs tradi ...

(approximate date) * He Jintao, general of the

* Hilduin, archbishop of

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 ...

( 775) * Li Chengmei, prince of the Tang dynasty * Li Rong, prince of the Tang dynasty * Muhammad at-Taqi, Muslim ninth Ismā'īlī imam (or

) * Salmawaih ibn Bunan, Muslim physician * Wen Zong, emperor of the Tang dynasty ( 809) *

Wigstan Wigstan (, ; died c. 840 AD), also known as Saint Wystan, was the son of Wigmund of Mercia and Ælfflæd, daughter of King Ceolwulf I of Mercia. History Like many Mercians of the period very little is known about Wigstan. He was the son of W ...

, king of

(approximate date) * Yang, consort and

concubine Concubinage is an interpersonal relationship, interpersonal and Intimate relationship, sexual relationship between two people in which the couple does not want to, or cannot, enter into a full marriage. Concubinage and marriage are often regarde ...

of Wen Zong

References

Sources

* {{DEFAULTSORT:840