Events

• Fujiwara no Yoshifusa becomes regent of Japan, starting the Fujiwara regentship.
• Alfonso III succeeds as king of Asturias.
• Louis II beats the Saracen invaders in Italy.
• Ivar the Boneless crosses over to England and beats and captures king Ella of Northumbria , thus revenging his father Ragnar Lodbrok.
• Ethelred succeeds as king of Wessex (or 865).
• Pope Nicholas I forbids the use of torture in prosecutions for witchcraft.
• A "great Viking army" captures York.
• Harold Fairhair (850-933) wins a decisive battle in his quest to become king of all of Norway

Births

• September 19 - Emperor Leo VI of the Byzantine Empire (d. 912)

Deaths

• April - Bardas, co-emperor and de facto ruler of the Byzantine Empire (murdered)
• 27 May - Ordoño I, king of Asturias
• al-Kindi, Muslim philosopher
• Ethelbert, king of Wessex and Bretwalda (or 865)