1091

Events

Henry, son of William I, attempts a coup against his brothers but fails to seize the English throne.
The Normans take Sicily from the Islamic rulers.
Roger Guiscard takes Malta.
William Rufus of France invades Normandy and gains a foothold in it.
The Islamic Abbadid dynasty ruling in Spain falls when the Almoravids storm Seville.
Battle of Levounion: The Pechenegs besiege Constantinople, but are defeated so decisively by Emperor Alexius I that they fade into oblivion.
Cardiff Castle is built.
Athanasius VI bar Khamoro becomes Syriac Orthodox Patriarch of Antioch.
October 23 — London Tornado of 1091: A T8/F4 tornado is recorded in St Mary-le-Bow of London, England, which destroys London Bridge.