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This article is about the year 843. For the number, see 843 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||810s 820s 830s – 840s – 850s 860s 870s|
|Years:||840 841 842 – 843 – 844 845 846|
|843 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1596|
|Chinese calendar||壬戌年 (Water Dog)
3539 or 3479
— to —
癸亥年 (Water Pig)
3540 or 3480
|- Vikram Samvat||899–900|
|- Shaka Samvat||765–766|
|- Kali Yuga||3944–3945|
|Japanese calendar||Jōwa 10
|Minguo calendar||1069 before ROC
|Seleucid era||1154/1155 AG|
|Thai solar calendar||1385–1386|
- August – Treaty of Verdun: The Frankish Empire is divided into three kingdoms between the three surviving sons of the late emperor Louis the Pious. King Louis the German receives the eastern portion (everything east of the River Rhine) called the Eastern Frankish Realm which is the precursor to modern-day Germany. Emperor Lothair I receives the central portion (Low Countries, Alsace, Lorraine, Burgundy and northern half of Italy) called the Central Frankish Realm. King Charles the Bald receives the western portion (everything west of the River Rhône) called the Western Frankish Realm which later becomes modern-day France.
- Summer – Viking raiders attack Nantes, located on the River Loire, they kill the towns bishop along with many of the clergy, murdering men, women, and children. They plunder the western parts of Aquitaine, and reach an island north of the mounth of the River Garonne near what later will be La Rochelle. There the Vikings bring materials from the mainland, and build houses to spend the winter.
- Battle of Messac: Breton forces under Erispoe, count of Vannes, defeat the Franks led by Renaud d'Herbauges near the town of Messac at the River Vilaine. This battle marks a Breton war between Charles the Bald and Nominoe, duke of Brittany.
- Kenneth I (Cináed mac Ailpín), king of the Scots, also becomes king of the Picts, he is crowned (by the Stone of Destiny) as first monarch of the new nation of Scotland. The Alpin Dynasty of Scottish kings begins to reign.
- Summer – An Byzantine expedition under Theoktistos conquers Crete from the Saracens. After initial success, he is forced to abandon his army due to political intrigues in Constantinople. The troops are left behind and slaughtered by the Arabs.
- Al-Andalus: The city of Zaragossa (modern Spain) rises against the Umayyad Emirate of Córdoba.
- In the Chinese capital of Chang'an, a large fire consumes 4,000 homes, warehouses, and other buildings in the East Market, yet the rest of the city is at a safe distance from the blaze (which is largely quarantined in East Central Chang'an thanks to the large width of roads in Chang'an that produce fire breaks).
- Feast of Orthodoxy: Official end of Iconoclasm, empress Theodora II restores the veneration of icons in the Orthodox churches in the Byzantine Empire.
- Theodora II orders a persecution against the Paulicians throughout Anatolia, about 100,000 followers in the Byzantine Theme Armenia are massacred.
- Bridei VI, king of the Picts (Scotland)
- Fergus mac Fothaid, king of Connacht (Ireland)
- Fujiwara no Otsugu, Japanese statesman (b. 773)
- Jia Dao, Chinese poet and Buddhist monk (b. 779)
- April 19 – Judith of Bavaria, Frankish empress
- Landulf I, gastald (or count) of Capua (Italy)
- Renaud d'Herbauges, Frankish nobleman (b. 795)
- Makrypoulias (2000), p. 351
- Treadgold (1997), p. 447
- Rucquoi, Adeline (1993). Histoire médiévale de la Péninsule ibérique. Paris: Seuil. p. 87. ISBN 2-02-012935-3.
- Merriam-Webster (Jan 2000). Merriam-Webster's Encyclopedia of World Religions, p. 231. ISBN 08-777-90-442
- Leon Arpee (1946). A History of Armenian Christianity. The Armenian Missionary Association of America, New York, p. 107.