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This article is about the year 811. For the number, see 811 (number). For the telephone N11 code, see 8-1-1.
|Centuries:||8th century – 9th century – 10th century|
|Decades:||780s 790s 800s – 810s – 820s 830s 840s|
|Years:||808 809 810 – 811 – 812 813 814|
|811 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1564|
|Chinese calendar||庚寅年 (Metal Tiger)
3507 or 3447
— to —
辛卯年 (Metal Rabbit)
3508 or 3448
|- Vikram Samvat||867–868|
|- Shaka Samvat||733–734|
|- Kali Yuga||3912–3913|
|Japanese calendar||Kōnin 2
|Minguo calendar||1101 before ROC
|Seleucid era||1122/1123 AG|
|Thai solar calendar||1353–1354|
- Byzantine–Bulgarian War: Emperor Nikephoros I organises a new campaign against the Bulgarian Empire, gathering a expeditionary force around 80,000 men from all parts of the empire. He is accompanied by high-ranking officials and aristocrats, including his son Stauracius and brother-in-law Michael I Rangabe (both emperors later, for a while). Krum, ruler (khan) of Bulgaria, sends envoys to sue for peace. Nikephoros refuses to accept the terms and marched through the Balkan passes towards Pliska, the Bulgarian capital.
- July 23 – Nikephoros I reaches Pliska and destroys an Bulgarian army of 12,000 elite soldiers who guards the stronghold. Another hastily assembled relief force of 50,000 soldiers has a similar fate. The Byzantines capture the defenseless capital. Nikephoros plunders the city and captures Krum's treasury. He burns the countryside, slaughters sheep and pigs, as he pursues the retreating Bulgars south-west towards Serdica (modern-day Sofia).
- July 26 – Battle of Vărbitsa Pass: Nikephoros I is trapped (probably in the Vărbitsa Pass) and defeated by the Bulgars, who use the tactics of ambush and surprise night attacks to immobilize the Byzantine forces. Nikephoros himself is killed, Krum has the emperor's head carried back in triumph on a pole where it is cleaned out, lined with silver and made into a jeweled skull cup which he allows his Slavic princes (archons) to drink from with him.
- Stauracius is installed as emperor at Adrianople (first time a Byzantine emperor is crowned outside Constantinople). Because of a sword wound near his neck (during the Battle of Pliska), Stauracius is paralyzed. The imperial court is split between the noble factions of his wife Theophano and his sister Prokopia.
- October 2 – Michael I is declared emperor of the Byzantine Empire; Stauracius is forced by senior officials to retire to a monastery.
- Treaty of Heiligen: King Hemming of Denmark concludes a peace treaty with emperor Charlemagne in present-day Rendsburg. The southern boundary of Denmark is established at the Eider River.
- Fourth Fitna: Abbasid caliph Al-Amin appoints Ali ibn Isa ibn Mahan as governor of Khurasan in northeast of Persia and sends him with an Muslim army (40,000 men) against his half-brother Al-Ma'mun.
- Battle of Rayy: Muslim cavalry forces (10,000 men) under Tahir ibn Husayn defeat a large infantry army of Al-Amin at Rayy (modern Iran). During the fighthing Ali ibn Isa ibn Mahan is killed.
- Basil I, emperor of the Byzantine Empire (d. 886)
- Muhammad al-Jawad, ninth Twelver Shī'ah Imām (d. 835)
- Ōe no Otondo, Japanese scholar (d. 877)
- Ali ibn Isa ibn Mahan, Muslim military leader
- Charles the Younger, son of Charlemagne
- July 24 – Gao Ying, chancellor of the Tang Dynasty (b. 740)
- Pepin the Hunchback, son of Charlemagne
- July 26 – Nikephoros I, emperor of the Byzantine Empire
- Sakanoue no Tamuramaro, Japanese shogun (b. 758)
- Anonymus Vaticanus, p. 148
- Anonymus Vaticanus, pp. 148-149
- Anastasius Bibliothecarius. Chronographia tripertita, p. 329
- Anonymus Vaticanus, p. 150
- John V.A. Fine, Jr. (1991). The early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, p. 97. ISBN 978-0-472-08149-3
- Treadgold, p. 429; Bury, p. 17
- Treadgold, p. 429; Finlay, p. 128