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This article is about the year 1086.
|Centuries:||10th century – 11th century – 12th century|
|Decades:||1050s 1060s 1070s – 1080s – 1090s 1100s 1110s|
|Years:||1083 1084 1085 – 1086 – 1087 1088 1089|
|1086 by topic|
|Lists of leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1839|
|English Regnal year||20 Will. 1 – 21 Will. 1|
|Chinese calendar||乙丑年 (Wood Ox)
3782 or 3722
— to —
丙寅年 (Fire Tiger)
3783 or 3723
|- Vikram Samvat||1142–1143|
|- Shaka Samvat||1007–1008|
|- Kali Yuga||4186–4187|
|Japanese calendar||Ōtoku 3
|Minguo calendar||826 before ROC
|Seleucid era||1397/1398 AG|
|Thai solar calendar||1628–1629|
|Wikimedia Commons has media related to 1086.|
- 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 – Henry V, Holy Roman Emperor and King of Germany (d. 1125)
- August 20 – Bolesław III Wrymouth, Prince of Poland (d. 1138)
- March 18 – Anselm of Lucca, Italian bishop (b. 1036)
- May 21 – Richilde, Countess of Hainaut, Flemish consort and regent (b. c. 1018)
- 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)