Valence's father William was a half‐brother of Henry III, being a son of John's widow Isabella by her second marriage, and came to England in 1247. Aymer de Valence inherited in 1296 and spent his early years campaigning in Scotland, fighting at Falkirk (1298) and defeating Robert I Bruce at Methven in 1306. The following year he was himself defeated by Bruce at Loudoun Hill. In 1307 he was recognized as earl of Pembroke by virtue of his mother, a granddaughter of William Marshal, earl of Pembroke (d. 1219). In Edward II's reign he was at first an Ordainer but switched to the king's side after the murder of Gaveston, who was seized from his custody. He fought for the king at Bannockburn and was subsequently employed watching the Scots and on diplomatic missions.
Subjects: British History.