1086

Events 
 The Domesday Book is completed in England.
 Emperor Shirakawa of Japan starts his cloistered rule.
 The Imam Ali Mosque is rebuilt by the Seljuk Malik Shah I after being destroyed by fire.
 May 24 — Pope Victor III succeeds Pope Gregory VII as the 158th pope, though he does not accept election until May 9, 1087.
 October 23 – Battle of az-Zallaqah: Alfonso VI of León and Castile is defeated by the Almoravids, who had been called into Spain by Abbad III of Sevilla.

 Deaths 
 May 21 — Richilde, Countess of Mons and Hainaut
 May 21 — Wang Anshi, Chinese statesman, economist and poet (b. 1021)
 July 17 — King Canute IV of Denmark (b. 1043)
 September 25 — William VIII, Duke of Aquitaine (b. 1025)
 Sima Guang, Chinese historian and statesman (b. 1019)