Calendar overview 820
, Michael II becomes Emperor of the Byzantine Empire .
|820 in other calendars|
|Armenian calendar||268/269 (turn of the year July)|
|Buddhist calendar||1363/64 (southern Buddhism); 1362/63 (alternative calculation according to Buddha's Parinirvana )|
|Chinese calendar||58th (59th) cycle|
|Chula Sakarat (Siam, Myanmar) / Dai calendar (Vietnam)||182/183 (turn of the year April)|
|Iranian calendar||198/199 (around March 21)|
|Islamic calendar||204/205 (June 16/17)|
|Jewish calendar||4580/81 (September 12/13)|
ab urbe condita MDLXXIII (1573)
Diocletian's era : 536/537 (New Year November)
|Seleucid era||Babylon: 1130/31 (turn of the year April)
Syria: 1131/32 (turn of the year October)
|Vikram Sambat (Nepalese Calendar)||876/877 (turn of the year April)|
Politics and world events
- December: A plot against Emperor Leo V is uncovered, the conspirators around Michael Psellos are imprisoned and sentenced to death.
- December 25th : Followers of imprisoned Michael murder Emperor Leo V , Michael II becomes Byzantine emperor and establishes the Amorian dynasty . Leo's four sons, including co-emperor Konstantinos , are left alive, but banished together with their mother to the prince island of Proti in the Sea of Marmara . There they are sheared to monks and castrated in order to exclude them as heir to the throne, but they are allowed to keep part of their property.
First documentary mentions
- Hasel and Fällanden have their first documentary mention.
- Drente is first mentioned in a document.
- The red dragon is first demonstrably used as a symbol of Wales .
Science, religion and culture
- earliest known mention of the St. Gallen Abbey Library
Exact date of birth unknown
Born around 820
- Photios I , Patriarch of Constantinople († 891 )
- Ramnulf I , Count of Poitou († 866 )
- Rhodri the Great , Welsh King († 878 )
- Vímara Peres , Galician warlord († 873 )
- December 25th : Leo V , General and Byzantine Emperor (* 775 )
- Remedius , Bishop of Chur
- asch-Schāfiʿī , Islamic scholar (* 767 )
- Tang Xianzong , Emperor of China