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