Calendar overview 811
|Bulgarians under Khan Krum defeat the Byzantine emperor Nikephorus I in the battle of the Warbiza Pass .|
|811 in other calendars|
|Armenian calendar||259/260 (turn of the year July)|
|Buddhist calendar||1354/55 (southern Buddhism); 1353/54 (alternative calculation according to Buddha's Parinirvana )|
|Chinese calendar||58th (59th) cycle|
|Chula Sakarat (Siam, Myanmar) / Dai calendar (Vietnam)||173/174 (turn of the year April)|
|Iranian calendar||189/190 (around March 21)|
|Islamic calendar||195/196 (September 22-23)|
|Jewish calendar||4571/72 (September 21-22)|
from urbe condita MDLXIV (1564)
Diocletian's era : 527/528 (November turn of the year)
|Seleucid era||Babylon: 1121/22 (turn of the year April)
Syria: 1122/23 (New Year October)
|Vikram Sambat (Nepalese Calendar)||867/868 (turn of the year April)|
Politics and world events
The Franconian Empire and its neighbors
- Peace treaty between Charlemagne and the Danish Empire ; the Eider is determined as the state border after negotiations on the Grönsfurth (until 1864 ).
- At the Frankish Reichstag in Aachen it is decided to send an army to Pannonia to settle the disputes between Avars and Slavs .
- Another eight-year uprising against the Muslims in Toledo . Charlemagne now controls all of Catalonia .
- July 26 : The Bulgarians under Khan Krum inflict the worst defeat on the Byzantine Empire since the Battle of Adrianople in 378 in the Battle of the Warbiza Pass . Emperor Nikephorus I falls in battle. He is succeeded by his son Staurakios . However, he was seriously injured after the battle and was overthrown by his brother-in-law Michael I in early October and banished to a monastery.
- Beginning of the civil war between Caliph al-Amin and his brother Al-Ma'mun , which lasted until 813 .
First documentary mentions
science and technology
- August: In Europe a report on the observation of the Perseids is available for the first time .
- July 26 : Nikephorus I , Emperor of the Byzantine Empire (* around 785 )
- August 25 : Egino , Bishop of Constance (* around 760 )
- December 4 : Charles the Younger , Frankish nobleman and heir, son of Charlemagne, King of Neustria (* 772 / 773 )
- Pippin the Hunchback , Frankish nobleman, eldest son of Charlemagne (* around 770 )
- 811/ 812 : Hemming , Danish Viking king