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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.|
- Northumbria in England is divided by the Normans into the counties of Northumberland, County Palatine of Durham, Yorkshire, Westmorland and Lancashire.
- George II resigns the throne of Georgia in favor of his 16-year-old son, David IV.
- August 11 – A powerful earthquake is recorded in Britain.
- June 22 – Gaston IV of Bearn and the Frankish crusaders take the Aragonese city of Monzón, from the emir of Zaragoza.
- Cîteaux Abbey, the first Cistercian monastery, is founded in southern France.
- The Synod of Melfi (under Pope Urban II) issues decrees against simony and clerical marriage. Supposedly, this council declares that the concubines and illegitimate wives of these clerics are subject to slavery.
- September – A church council, held in Constantinople discuses relations between Christian East and West.
- date unknown
- May 24 – Lanfranc, Archbishop of Canterbury
- May 31 – Sigwin von Are, Archbishop of Cologne
- September 29 or September 30 – Theobald III, Count of Blois
- November 11 – Saint Peter Igneus, Italian Benedictine monk
- Siecienski, Anthony Edward (2010). The Filioque: History of a Doctrinal Controversy. Oxford University Press.