William de Valence, 1st Earl of Pembroke, (1225-1230 – May 16 or 18, 1296), also 1st Earl of Wexford
It was the birthplace of William de Valence, who later became Earl of Pembroke.
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The earldom of Pembroke lay vacant until 1247, when it was recreated for William de Valence, husband of Joan de Munchensi, heiress of Anselm's sister Joan and her husband Warin de Munchensi.
He died unmarried and childless, ending the senior male line of the House of Lusignan (a junior male line through Guy's great-uncle, William de Valence, continued until the death of that man's son, Aymer, in 1324).
The three were William of Valence, Guy of Lusignan and Aymer.
In 1247, the castle was inherited by William de Valence, a half-brother of Henry III who became Earl of Pembroke through his marriage to Joan, William Marshal's granddaughter.
In the late 13th century, the castle and the town had become part of the feudal lands of William de Valence, 1st Earl of Pembroke.