Sir William de Valence Earl of Pembroke 
Sir William de Valence was born in 1225 in Cistercian Abbey, Valence, Charete, France. Sir William de Valence's father was Hugh de la Marche X le Brun Ct de la Marche and his mother was Isabella Taillefer de AngoulIme. He had five brothers and five sisters, named Hugh de Lusignan, Guy de Lusignan, Geoffrey le Brun, Aymer Ademar de Valence, Henri de la Marche, Alice, Isabella, Marguerite, Agnes and Isabella. He had two half-brothers and three half-sisters, named Henry III Plantagenet, Richard of Cornwall, Joan, Isabella and Eleanor. He died at the age of 71 on May 17th, 1296.General Notes
REF: "Falls the Shadow" Sharon Kay Penman: During Simon de Montfort's barons war, March 31, 1264 Londoners riot (London was very pro de Montfort), burn townhouses of the hated William de Lusignan, also prominent Royalist Lord Philip Basset, also Richard of Cornwall's Westminster manor, & his beloved Isleworth manor 7 miles away. Richard overnight goes from trying to mediate a solution to, like Edward, ardently desiring a battlefield confrontation.
April 5 1264 Bran de Montfort leads defense of St. Andrew's Priory within the town & fights with suicidal bravery. The walls had been undermined by the Prior who was secretly in league with Prince Edward, & Bran was captured by some common soldiers. At that point William de Lusignan & Ralph de Mortimer rode up. Bran had just before taken part in the looting of de Mortimer's lands in Radnorshire. de Lusignan ordered his nephew Bran killed on the spot, but Dafydd ap Gruffydd rode up & intervened telling them Edward would be displeased to see his cousin Bran killed. de Lusignan attempts to argue but Philip Basset (who commanded the attackers) then rode up & commanded Bran be taken to Edward, and not to be escorted by de Lusignan or de Mortimer, as they would arrange an "accident" for Bran. Bran congratulated for his gallant bravery by Edward & then sent to King Henry who moves him to Windsor Castle. Abandoned nephew Prince Edward at Battle of Lewes (14 May 1264) when Edward returned from his savage pusuit of the Londoner contingent of the rebel forces back to the battle to see Henry III (de Lusignan's 1/2 brother) under seige at Lewes priory & the victory to Montfort (de Lusignan's 1/2 brother in law). After Lewes, forfeited lands to Gilbert de Clare. By April 1265, landed in South wales with John de Warenne.
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