Events

• First attack on Constantinople by Swedish Vikings (the Rus, see Varangians).
• Ethelbert succeeds as king of Wessex.
• Byzantine missionaries Cyril and Methodius arrive in Khazaria.
• The later Harald I of Norway becomes king.
• Michael I succeeds Sophronius I as patriarch of Alexandria.

Births

• Hrolf Ganger, Viking leader, duke of Normandy

Deaths

• Ethelbald, king of Wessex
• Halfdan the Black, king of parts of Norway (b. 820)