|Covid-19|Emperor Shirakawa of Japan starts his cloistered rule.
The Imam Ali Mosque in Najaf is rebuilt by the Seljuk Malik Shah I after being destroyed by fire.
October 23 – Battle of Sagrajas: Alfonso VI of León and Castile is defeated by the Almoravids, who had been called into Spain by Abbad III of Sevilla.
The Domesday Book is completed in England.
Syracuse, the last Muslim stronghold in Sicily, is conquered by the Normans.
May 24 – Pope Victor III succeeds Pope Gregory VII as the 158th pope, though he does not accept election until May 9, 1087.
August 11 or 1081 – Henry V, Holy Roman Emperor and King of Germany (d. 1125)
August 20 – Bolesław III Wrymouth, Prince of Poland (d. 1138)
March 15 – Richilde, Countess of Hainaut, Flemish consort and regent (b. c. 1018)
March 18 – Anselm of Lucca, Italian bishop (b. 1036)
May 21 – Wang Anshi, Chinese statesman, economist and poet (b. 1021)
July 10 – King Canute IV of Denmark (b. 1043)
September 25 – William VIII, Duke of Aquitaine (b. 1025)
October 11 – Sima Guang, Chinese historian and statesman (b. 1019)
Year 1086 (MLXXXVI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.
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