1054 Siward, Earl of Northumbria invaded Scotland to support Malcolm Canmore against Macbeth of Scotland, who usurped the Scottish throne from Malcolm's father, King Duncan. Macbeth was defeated at Dunsinane.
1170: Thomas Becket and King Henry II temporarily reconciled. Becket's six-year self-imposed exile from England was resolved when he met with Henry and King Louis VII of France at a conference in Freteval and settled on an uneasy truce. Becket made preparations to return to his See in Canterbury.
1214 King John lost Normandy and his other French possessions after being defeated by Philip II of France in the Battle of Bouvines.
1360 Danish King Waldemar IV destroyed Visby Gotland (Sweden's largest island, which is also the largest island in the Baltic Sea).