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This article is about the year 841. For the number, see 841 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||810s 820s 830s – 840s – 850s 860s 870s|
|Years:||838 839 840 – 841 – 842 843 844|
|841 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1594|
|Chinese calendar||庚申年 (Metal Monkey)
3537 or 3477
— to —
辛酉年 (Metal Rooster)
3538 or 3478
|- Vikram Samvat||897–898|
|- Shaka Samvat||763–764|
|- Kali Yuga||3942–3943|
|Japanese calendar||Jōwa 8
|Minguo calendar||1071 before ROC
|Seleucid era||1152/1153 AG|
|Thai solar calendar||1383–1384|
- June 25 – Battle of Fontenay: Frankish forces of emperor Lothair I and his nephew Pepin II of Aquitaine are defeated by allied forces of king Louis the German and his half-brother Charles the Bald at Fontenoy (Eastern France), in a civil war among the three surviving sons of the former emperor Louis the Pious. A total of 40,000 men are killed, including the Frankish nobles Gerard of Auvergne and Ricwin of Nantes fighting on the side of Charles.
- Summer – Vikings sail up the River Seine and devastate the city of Rouen in Normandy. They burn the Benedictine monastery of Jumièges Abbey, 68 captives are taken and returned on payment of a ransom by the monks of St. Denis.
- The town of Dyflin (meaning "Black Pool") or Dublin (modern Ireland) is founded by Norwegian Vikings on the south bank of the River Liffey. The settlement is fortified with a ditch and an earth rampart with a wooden palisade on top. The Norsemen establish a wool weaving industry and there is also a slave trade. An artificial hill is erected where the nobility meets to make laws and discuss policy.
- Constantine Kontomytes, Byzantine general (strategos) of the Thracesian Theme, inflicts a servere defeat on the Cretan Saracens. He leads an Byzantine expeditionary force to raid the monastic community near Mount Latros (modern Turkey).
- Venice sends an fleet of 60 galleys (each carryring 200 men) to assist the Byzantines in driving the Arabs from Crotone, but the attack fails. Muslim troops conquer the city of Brindisi (approximate date).
- Pro-Umayyad rebellion of Al-Mubarqa in Palestine against caliph Al-Mu'tasim of the Abbasid Caliphate (ending in 842).
- In the Chinese capital of Chang'an, the West Market (and East Market) are closed every night 1 hour and three quarters before dusk (by government-ordered), the curfew signals by the sound of 300 beats to a loud gong. After the official markets been closed for the night, small night markets in residential areas thrive with plenty of customers, despite government efforts to shut them down. With the decline of the government's authority (by mid 9th century), this edict (like many others) is largely ignored as urban dwellers keep attending the night markets regardless.
- Bernard Plantapilosa, Frankish nobleman (d. 886)
- Boso of Provence, Frankish nobleman (approximate date)
- Du Rangneng, chancellor of the Tang Dynasty (d. 893)
- Edmund the Martyr, king of East Anglia (approximate date)
- Heiric of Auxerre, Frankish theologian and writer (d. 876)
- Arnulf of Sens, illegitimate son of Louis the Pious
- June 25 – Gerard of Auvergne, Frankish nobleman
- Guifeng Zongmi, Chinese Buddhist monk (b. 780)
- Jang Bogo, Korean maritime hegemon (or 846)
- Khaydhar ibn Kawus al-Afshin, Muslim general
- Langdarma, emperor of Tibet (b. 799)
- Li Ao, Chinese philosopher and prose writer (b. 772)
- June 25 – Ricwin of Nantes, Frankish nobleman