1089 Events
By place
Europe
April 20 (possible date) – 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 (supported by French crusaders ) reconquers the Aragonese city of Monzón from Emir Al-Mustain II of the Taifa of Zaragoza .[ 1]
August 18 – Henry IV, Holy Roman Emperor , marries Eupraxia of Kiev (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 ).
Deaths
April 20 (possible date) – 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 (r. 1075–1094).
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 (approximate date)
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 (or Thibaut), French nobleman