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|812 by topic|
|Ab urbe condita||1565|
|Balinese saka calendar||733–734|
|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||733–734|
|- Kali Yuga||3912–3913|
|Japanese calendar||Kōnin 3|
|Minguo calendar||1100 before ROC|
|Seleucid era||1123/1124 AG|
|Thai solar calendar||1354–1355|
938 or 557 or −215
— to —
939 or 558 or −214
- 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 re-opens peace negotiations with the Franks, and recognizes 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 Emirate of Córdoba.
- Charlemagne issues the Capitulare de villis, concerning the rights of a feudal landholder and the services owed by his dependents. It also contains the names of some 89 plants, of which 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 evidences of the independence of the city.
- At the death of king Hemming of Denmark two claimants to the throne, Sigfred and Anulo, meet in battle but are both killed. Harald and Reginfrid, brothers of Anulo, becomes joint kings of Denmark.
- Fourth Fitna: Forces loyal to al-Ma'mun, led by Tahir ibn Husayn, blockade Baghdad, which is loyal to al-Ma'mun's brother, Caliph al-Amin, and begin the year-long Siege of Baghdad.
- Domnall mac Ailpín, king of Scotland (d. 862)
- Li Rong, prince of the Tang Dynasty (or 813)
- Sugawara no Koreyoshi, Japanese nobleman (d. 880)
- Wang Yuankui, general of the Tang Dynasty (d. 854)
- Wen Tingyun, Chinese poet and lyricist (d. 870)
- January 11 – Staurakios, Byzantine emperor
- Abd al-Malik ibn Salih, Abbasid general (b. 750)
- Candidus of Fulda, Benedictine scholar
- Du You, chancellor of the Tang Dynasty (b. 735)
- Flann mac Congalaig, king of Brega (Ireland)
- Fujiwara no Uchimaro, Japanese nobleman (b. 756)
- Hemming, king of Denmark
- Ibrahim I, Muslim emir of the Aghlabids (b. 756)
- Jeong, king of Balhae (Korea) (approximate date)
- Li Ning, prince of the Tang Dynasty (b. 793)
- Nikephoros, son of Constantine V (approximate date)
- Tian Ji'an, general of the Tang Dynasty
- William of Gellone, Frankish nobleman (or 814)
- Fine, John V. A. Jr. (1991) . The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century. Ann Arbor, Michigan: University of Michigan Press. ISBN 0-472-08149-7.
- Benvenuti, Gino (1985). Le Repubbliche Marinare. Amalfi, Pisa, Genova e Venezia. Rome: Newton & Compton Editori. p. 13. ISBN 88-8289-529-7.