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|1089 by topic|
|Lists of leaders|
|Political entities - State leaders - Religious leaders|
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|Births – Deaths|
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|Establishments – Disestablishments|
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- 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.
- 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