Feb 08 Hulagu Khan, Mongol ruler (b. 1217) died in the year 1265.
Apr 25 Roger de Quincy, 2nd Earl of Winchester, English crusader died in the year 1265.
May 16 Saint Simon Stock, English saint (b. 1165) died in the year 1265.
Aug 04 In the year 1265 simon de Montfort, English earl of Leicester, dies in battle
Dec 03 In the year 1265 death of odofredus, Italian jurist