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|1089 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1842|
|Balinese saka calendar||1010–1011|
|English Regnal year||2 Will. 2 – 3 Will. 2|
|Chinese calendar||戊辰年 (Earth Dragon)|
3785 or 3725
— to —
己巳年 (Earth Snake)
3786 or 3726
|- Vikram Samvat||1145–1146|
|- Shaka Samvat||1010–1011|
|- Kali Yuga||4189–4190|
|Japanese calendar||Kanji 3|
|Minguo calendar||823 before ROC|
|Seleucid era||1400/1401 AG|
|Thai solar calendar||1631–1632|
1215 or 834 or 62
— to —
1216 or 835 or 63
|Wikimedia Commons has media related to 1089.|
- King Demetrius Zvonimir of Croatia, dies after a 12-year reign and is succeeded by Stephen II. Zvonimir's widow, Queen Helena plots the inheritance of the Croatian crown for her brother, King Ladislaus I of Hungary.
- June 24 – Viscount Gaston IV of Béarn (supported by French crusaders) reconquers the Aragonese city of Monzón, from Emir Al-Mustain II of the Taifa of Zaragoza.
- August 18 – Emperor Henry IV marries Eupraxia (daughter of Grand Prince Vsevolod I) at Cologne. She is crowned and assumes the name Adelaide (or Adelheid).
- King George II abdicates the throne in favor of his 16-year-old son David IV (the Builder) who becomes ruler of Georgia (until 1125).
- Northumbria is divided by King William II into the counties of Northumberland, County Palatine of Durham, Yorkshire, Westmorland and Lancashire.
- August 11 – A powerful earthquake is recorded in England.
- March 21 – Cîteaux Abbey, the first Cistercian monastery, is found by a group of French monks under Robert of Molesme in southern France.
- September – The Synod of Melfi led by Pope Urban II (his first papal council) issues decrees against simony and clerical marriage.
- September – A church council, held in Constantinople discuses relations between Eastern and Western Christianity.
- Abraham ibn Ezra, Jewish rabbi and philosopher (d. 1167)
- Dahui Zonggao, Chinese Zen Buddhist monk (d. 1163)
- Han Shizhong, Chinese general (Song Dynasty) (d. 1151)
- Mahsati, Persian female poet and writer (approximate date)
- Richard de Luci, Norman High Sheriff of Essex (d. 1179)
- May 24 – Lanfranc, archbishop of Canterbury
- May 31 – Sigwin of Are, archbishop of Cologne
- October 6 – Adalbero, bishop of Würzburg
- November 11 – Peter Igneus, Italian cardinal-bishop
- December 22 – William the Walloon, French abbot
- Agnes of Aquitaine, Italian countess of Savoy
- Demetrius Zvonimir, king of Croatia and Dalmatia
- Donnchad mac Domnaill Remair, king of Dublin
- Durandus of Troarn, French monk and theologian
- Isaac ibn Ghiyyat, Jewish rabbi and philosopher (b. 1038)
- Mieszko Bolesławowic, Polish prince of Kraków
- Renauld II, French count of Nevers and Auxerre
- Theobold III (or Thibaut), French nobleman
- Siecienski, Anthony Edward (2010). The Filioque: History of a Doctrinal Controversy. Oxford University Press.