Feb 13 Minamoto no Sanetomo, Japanese 3rd shōgun of the Kamakura shogunate May 5 King Leo II of Armenia (b. 1150) May 14 William Marshall, 1st Earl of Pembroke 'the best knight in all the world', Anglo-French soldier and advisor to English Kings (regent to Henry III), dies at 72 [1] 1218 Famous Deaths by Year 1220 Famous People by Cause of Death Assassination Car Crash Hanging Killed in Action Plane Crash Poisoning