Year 1089 (MLXXXIX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.
Events
By place
Europe
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 favour of his 16-year-old son David IV (the Builder) who becomes ruler of Georgia (until 1125).
England
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.
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. September The Synod of Melfi, led by Pope Urban II (his first papal council), 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 (d. 1167) Berthold of Zwiefalten, German abbot and writer (d. 1169) 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) Sigurd I (the Crusader), king of Norway (d. 1130) Wulgrin II, count of Angoulême (approximate date)
Deaths
May 24 – Lanfranc, archbishop of Canterbury
May 29/30 – Mah-i Mulk Khatun wife of caliph al-Muqtadi (r. 1075–1094). 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 Mieszko Bolesławowic, Polish prince of Kraków Renauld II, French count of Nevers and Auxerre Theobold III (or Thibaut), French nobleman