February – Battle of Mortemer: The Normans defeat a French army as it is caught stealing. King Henry I of France removes his main army from Normandy as a result.
April 30 – Rosdalla, Kilbeggan Ireland: Earliest known European tornado.
July 27 – Siward, Earl of Northumbria invades Scotland to support Malcolm Canmore against Macbeth, who took the Scottish throne from Malcolm's father, King Duncan. Macbeth is defeated at Dunsinane.
Lý Nhật Tôn, third king of the Lý Dynasty, begins to rule in Vietnam and changes the country's official name to Đại Việt.
East-West Schism in the Christian church, where the churches got separated and became the Catholic and the Orthodox christian churches.
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