Page "Earl of Pembroke" Paragraph 27

William's eldest surviving son, Aymer ( c. 1265 – 1324 ), succeeded to his father's estates, but was not formally recognized as Earl of Pembroke until after the death of his mother Joan in 1307.

He was appointed guardian of Scotland in 1306, but with the accession of Edward II to the throne and the consequent rise of Piers Gaveston to power, his influence declined.

He became prominent among the discontented nobles, but in 1312, after the Earl of Warwick betrayed him by executing the captured Gaveston, he left the allied lords and joined the King.

Valence was present at Bannockburn in 1314, and later helped King Edward defeat Thomas of Lancaster.

However, by his death in 1324, he was again marginalized at court, and in financial trouble as well.

His wife, Mary de Châtillon, a descendant of King Henry III, was the founder of Pembroke College, Cambridge.