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This article is about the year 812. For the number, see 812 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||780s 790s 800s – 810s – 820s 830s 840s|
|Years:||809 810 811 – 812 – 813 814 815|
|812 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1565|
|Chinese calendar||辛卯年 (Metal Rabbit)
3508 or 3448
— to —
壬辰年 (Water Dragon)
3509 or 3449
|- Vikram Samvat||868–869|
|- Shaka Samvat||734–735|
|- Kali Yuga||3913–3914|
|Japanese calendar||Kōnin 3
|Minguo calendar||1100 before ROC
|Seleucid era||1123/1124 AG|
|Thai solar calendar||1354–1355|
- January 11 – Ex-emperor Staurakios, a son of Nikephoros I, dies of putrefaction in his wounds (see 811) in a monastery. He has reigned only two months and eight days, before being exiled by senior officials in Constantinople.
- Emperor Michael I reopens peace negotiations with the Franks, and recognises Charlemagne as emperor (basileus) of the Frankish Empire. In exchange for this recognition, Venice is returned to the Byzantine Empire.
- Byzantine–Bulgarian War: The Bulgars led by Krum, ruler (khan) of the Bulgarian Empire, launch an invasion against the Byzantines. They capture the fortress cities of Develt and Mesembria near the Black Sea.
- Charlemagne conquers Catalonia as far south as the River Ebro and the Balearic Islands. The counties come under the rule of Bera, count of Barcelona. He signs a three year peace treaty with the Caliphate of Córdoba.
- Charlemagne issues the Capitulare de villis, concerning the rights of a feudal landholder and the services owed by his dependants. It contains also the names of some 89 plants, of which the most are used medically.
- The Republic of Amalfi sends galleys to support the Byzantine general (strategos) of Sicily, Gregorio, against the Aghlabid invaders. It is one of the earliest evidence of the independence of the city.
- Candidus of Fulda, Benedictine scholar
- Du You, chancellor of the Tang Dynasty (b. 735)
- Flann mac Congalaig, king of Brega (Ireland)
- Hemming, king of Denmark
- Ibrahim I, Muslim emir of the Aghlabids (b. 756)
- Li Ning, prince of the Tang Dynasty (b. 793)
- Nikephoros, son of Constantine V (approximate date)
- January 11 – Staurakios, Byzantine emperor
- William of Gellone, Frankish nobleman (or 814)