Feb 25 Dafydd ap Llywelyn, King of Gwynedd, 1st to take name Prince of Wales, dies at about 33
May 31 Isabella of Angouleme, queen consort of King John of England (1200-16) and Countess of La Marche, dies at about 58
Jun 15 Frederik II "the Warlike", duke of Austria and Styria (1230-46), dies at the Battle of Leitha at 35
Jun 16 Lutgardis [Ludgardis], Flemish mystic and saint, dies at about 64
Sep 20 Michael of Chernigov, Ruler and grand prince of Kiev (1234-43), trampled, slaughtered and martyred at around 61 on orders of the Khan of the Golden Horde, Batu Khan, for refusing to bow to the fires and idols of the Mongols
Sep 30 Yaroslav II of Russia, Grand Prince of Vladimir (1238-46), dies at 55
Nov 8 Berenguela of Castile, wife of Alfonso IX of Castile (b. 1180)
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide