at the Battle of Evesham in 1265, William continued to serve Henry III, and then Edward I, until his death in 1296. William's eldest surviving son, Aymer de Valence, 2nd Earl of Pembroke (c. 1265–1324), succeeded to his father's estates, but he 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 King Edward II to the throne and the consequent rise of his favourite Piers Gaveston to power, his influence declined and he became prominent among the discontented nobles. In 1312, after the Earl of Warwick betrayed him by executing the captured Gaveston, Aymer de Valence left the allied lords and joined the King. Valence was present at the Battle of Bannockburn in 1314, and later helped King Edward defeat the Earl of Lancaster. However, by the time of his death in 1324, he had again been marginalized at court, and also suffered financial trouble. His wife Mary de Châtillon founded Pembroke College, Cambridge and also Denny Abbey, between Cambridge and Ely, where she spent her last days surrounded by nuns. Kings of Cyprus After another six-year truce with the Muslims, Aimery and most of the royal family died. His only surviving son, Hugh, became King of Cyprus in 1205. The kingdom of Jerusalem passed to Maria of Montferrat, eldest daughter of Isabella and Conrad. Hugh married his step-sister, Alice of Champagne, daughter of Isabella and Henry of Champagne. They had three children. Henry, the youngest child and only son, became king in 1218 at eight months of age; Alice officially served as his regent. Her uncle Phillip of Ibelin exercised the real power behind the throne, followed by his brother John of Ibelin, the Old Lord of Beirut. Henry was crowned at the age of 8 at Santa Sophia, Nicosia, in 1225. His uncle arranged the early coronation in a political maneuver intended to outflank Frederick II, Holy Roman Emperor expected attempt to seize power. Frederick succeeded in 1228 in forcing John of Ibelin to hand over the regency and the island of Cyprus. But, when Frederick left the island in April, John counter-attacked and regained control, which began the War of the Lombards. Henry assumed control of the kingdom when he came of age at 15, in 1232. He became regent of Jerusalem, in 1246, for