866

Asia

 * becomes regent of, starting the regentship.

Europe

 * succeeds as king of.
 * beats the invaders in.
 * crosses over to England and beats and captures king, thus revenging his father.
 * succeeds as king of (or ).
 * A "great army" captures.
 * (–) wins a decisive battle in his quest to become king of all of

Religion

 * forbids the use of in prosecutions for.

Births

 * —, (d. )

Deaths

 * April —, co-emperor of the Byzantine Empire (murdered)
 * — King
 * , Muslim philosopher
 * , Chinese monk of the who founded the  of