1089
Year 1089 was a common year starting on Monday of the Julian calendar.
Events
By place
Europe
- April 20 - Demetrius Zvonimir, king of Croatia, dies after a 12-year reign, and is succeeded by Stephen II. Zvonimir's widow, Helena of Hungary, Queen of Croatia, plots the inheritance of the Croatian crown for her brother, King Ladislaus I of Hungary.
- June 24 - Reconquista: Gaston IV, Viscount of Béarn reconquers the Aragonese city of Monzón from Emir Al-Mustain II of the Taifa of Zaragoza.
- August 18 - Henry IV, Holy Roman Emperor, marries Eupraxia of Kiev at Cologne. She is crowned and assumes the name Adelaide.
- King George II abdicates the throne in favour of his 16-year-old son David IV who becomes ruler of Georgia.
England
- August 11 - A powerful earthquake is recorded in England.
- Northumbria is divided by King William II into the counties of Northumberland, County Palatine of Durham, Yorkshire, Westmorland and Lancashire.
By topic
Religion
- March 21 - Cîteaux Abbey, the first Cistercian monastery, is established by a group of French monks under Robert of Molesme in southern France.
- August 28 - Braga Cathedral in the County of Portugal has its reconstruction completed sufficiently for its consecration to the Virgin Mary to take place.
- September
- * The Synod of Melfi, led by Pope Urban II, issues decrees against simony and clerical marriage.
- * A church council, held in Constantinople, discuses relations between Eastern and Western Christianity.
Births
- Abraham ibn Ezra, Jewish rabbi and philosopher
- Berthold of Zwiefalten, German abbot and writer
- Dahui Zonggao, Chinese Zen Buddhist monk
- Han Shizhong, Chinese general of the Northern Song dynasty
- Mahsati, Persian female poet and writer
- Richard de Luci, Norman High Sheriff of Essex
- Sigurd the Crusader, king of Norway
- Wulgrin II, count of Angoulême
Deaths
- April 20 - Demetrius Zvonimir, king of Croatia and Dalmatia
- May 24 - Lanfranc, Italian-born archbishop of Canterbury
- May 29/30 - Mah-i Mulk Khatun wife of caliph al-Muqtadi.
- May 31 - Sigwin von Are, archbishop of Cologne
- October 6 - Adalbero, Prince-Bishop of Würzburg
- November 11 - Peter Igneus, Italian cardinal-bishop
- December 22 - William the Walloon, French abbot
- Agnes of Aquitaine, French-born countess consort of Savoy
- Donnchad mac Domnaill Remair, Irish king of Dublin, killed
- Durandus of Troarn, French monk and theologian
- Isaac ibn Ghiyyat, Spanish Jewish rabbi and philosopher
- Mieszko Bolesławowic, Polish prince of Kraków
- Renauld II, French count of Nevers and Auxerre
- Theobald III, Count of Blois, French nobleman