- Yoshifusa becomes regent of Japan, starting the Fujiwara regentship.
- Alfonso III succeeds as king of Asturias.
- Louis II beats the Saracen invaders in Italy.
- Ivor 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.