Guillaume IX

Family In 1094, William married Philippa, the daughter and heiress of William IV of Toulouse. According to the Chronicle of Saint-Maixent, William and Philippa had two sons and five daughters, although it does not name them. His eldest son was his eventual successor, William X. His second son, Raymond, eventually became the Prince of Antioch in the Holy Land. A daughter, Agnes, married, firstly, Aimery V of Thouars, and then King Ramiro II of Aragon.

Armenian sources, Basil the Doctor and Gregory the Priest, imply that Baldwin of Marash was a son of William and Philippa, born shortly before the latter's retirement to a convent in 1114. Alternatively, he may have been an illegitimate son. Michael the Syrian reports that Reynald, Baldwin's successor as lord of Marash, was his brother.