- Feb 8 Hulagu Khan, Mongol ruler, grandson of Genghis Khan (besieged and pillaged Baghdad) (b. 1217)
- May 16 Saint Simon Stock, English saint (b. 1165)
- Aug 4 Hugh le Despencer, 1st Baron le Despencer (one of the leaders of the baronial rebellion against Henry III), killed at the Battle of Evesham (b. 1223)
- Aug 4 Simon de Montfort, English Earl of Leicester (led baronial rebellion against Henry III), dies at the Battle of Eversham
- Dec 3 Odofredus, Italian jurist
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning