1104

Events 
 September 3 – St. Cuthbert reburied in the Durham Cathedral
 The Venice Arsenal, is founded in Venice.
 Alfonso I of Aragon becomes King of Aragon and Navarre.
 Historian Guibert of Nogent becomes abbot of Notre Dame de Nogent.
 Baldwin I of Jerusalem captures Acre.
 Baldwin II, count of Edessa, is taken prisoner by the Seljuk Turks at the Battle of Harran; Tancred becomes regent.
 Kilij Arslan I, Sultan of Rüm, starts a war with the Danishmends.