Events

• Ruaidri Ua Conchobair (Rory O'Conner), last High King of Ireland, submits to Henry II as vassal of Ireland with the Treaty of Windsor
• Ly Cao Ton becomes ruler of Vietnam
• William of Tyre becomes archbishop of Tyre
• Massacre of Abergavenny ends with several noblemen dead at the hands of William de Braose
• Vordingborg Castle completed

Births

• Robert Grosseteste, English Prelate and scholar
• Andrew II, King of Hungary
• Fibonacci, famous Italian mathematician
• Michael Scot, mathematician and astrologer
• Otto IV, Holy Roman Emperor

Deaths

• Mleh of Armenia, ruler of the Armenian Kingdom of Cilicia