William II Longespée, English martyr (b. 1212)
Sir William Longespée (c. 1212 – 8 February 1250) was an English knight and crusader, the son of William Longespée and Ela, Countess of Salisbury. His death became of significant importance to the English psyche, having died at the Battle of Mansurah, near Al-Mansurah in Egypt.