William de Valence, 1st Earl of Pembroke
…abbey of Valence, near Lusignan in Poitou. William de Valence was the fourth son of Isabella of Angoulême, widow of King John, and her second husband, Hugh X of Lusignan, Count of La Marche, and was thus a half-brother to Henry III, and uncle to Edward I. William was born in the Cistercian abbey in Valence, Couhé-Vérac…