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812 in various calendars
Gregorian calendar	812; DCCCXII
Ab urbe condita	1565
Armenian calendar	261; ԹՎ ՄԿԱ
Assyrian calendar	5562
Balinese saka calendar	733–734
Bengali calendar	219
Berber calendar	1762
Buddhist calendar	1356
Burmese calendar	174
Byzantine calendar	6320–6321
Chinese calendar	辛卯年 (Metal Rabbit); 3509 or 3302; — to —; 壬辰年 (Water Dragon); 3510 or 3303
Coptic calendar	528–529
Discordian calendar	1978
Ethiopian calendar	804–805
Hebrew calendar	4572–4573
Hindu calendars
- Vikram Samvat	868–869
- Shaka Samvat	733–734
- Kali Yuga	3912–3913
Holocene calendar	10812
Iranian calendar	190–191
Islamic calendar	196–197
Japanese calendar	Kōnin 3; (弘仁３年)
Javanese calendar	708–709
Julian calendar	812; DCCCXII
Korean calendar	3145
Minguo calendar	1100 before ROC; 民前1100年
Nanakshahi calendar	−656
Seleucid era	1123/1124 AG
Thai solar calendar	1354–1355
Tibetan calendar	阴金兔年; (female Iron-Rabbit); 938 or 557 or −215; — to —; 阳水龙年; (male Water-Dragon); 939 or 558 or −214

Millennium:	1st millennium
Centuries:	8th century; 9th century ; 10th century;
Decades:	790s; 800s; 810s ; 820s; 830s;
Years:	809; 810; 811; 812 ; 813; 814; 815;

Year 812 (DCCCXII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar, the 812th year of the Common Era (CE) and Anno Domini (AD) designations, the 812th year of the 1st millennium, the 12th year of the 9th century, and the 3rd year of the 810s decade.

Events

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.^[1]

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.^[2]
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.