Events

• Abbasid caliph al-Mutasim establishes new capital at Samarra, Iraq.
• Egbert of Wessex is defeated by the Danes.
• John VII Grammaticus succeeds Antony I as patriarch of Constantinople.
• Presian succeeds Malamir as Khan of Bulgaria.
• Oldest known mentioning of the city of Soest.

Births

• Thabit ibn Kurrah , Arabian astronomer
• Fujiwara no Mototsune, Japanese regent (d. 891)
• Ethelbert of Wessex
• Constantine I, king of Scotland (d. 877)

Deaths