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. Biography Barons' Crusade The first of Longespée's two pilgrimages to the Holy Land was as a participant in the second wave of crusaders of the Barons' Crusade. On 10 June 1240 he left England in the service of Richard, 1st Earl of Cornwall with roughly a dozen English barons and several hundred knights. They made their way to Marseilles in mid-September, and landed at Acre on 8 October. Longespée and Richard's men saw no combat there, but this group did complete the negotiations for a truce with Ayyubid leaders made by Theobald I of Navarre just a few months prior during the first wave of the crusade. They rebuilt Ascalon castle, and notably handed over custody of it to Walter Pennenpié, the imperial agent of Frederick II in Jerusalem (instead of turning it over to the local liege men of the Kingdom of Jerusalem who strongly opposed Frederick's rule). On 13 April 1241 they exchanged Muslim prisoners with Christian captives who had been seized during Henry of Bar's disastrous raid at Gaza five months earlier. They also moved the remains of those killed in that battle and buried them at the cemetery in Ascalon. Longespée almost certainly departed with Richard for England on 3 May 1241. Seventh Crusade Longespée again made a pilgrimage to the Holy Land, this time in the Seventh Crusade of 1247. He proceeded to Rome and made a plea to Pope Innocent IV for support: "Sir, you see that I am signed with the cross and am on my journey with the King of France to fight in this pilgrimage. My name is great and of note, viz., William Longespée, but my estate is slender, for the King of England, my kinsman and liege lord, hath bereft me of the title of earl and of that estate, but this he did judiciously, and not in displeasure, and by the impulse of his will; therefore I do not blame him for it. Howbeit, I am necessitated to have recourse to your holiness for favour, desiring your assistance in this distress. We see here (quoth he) that Earl Richard (of Cornwall) who,