Normandy, the count of Blois, the duke of Burgundy (himself a Capetian after 1032) and the duke of Aquitaine (all of whom faced to a greater or lesser extent the same problems of controlling their subordinates). The House of Capet was, however, fortunate enough to have the support of the Church, and – with the exception of Philip I, Louis IX and the short-lived John I – were able to avoid the problems of underaged kingship. Capetian and Plantagenet Briefly, under Louis VII (1120–1180), the House of Capet rose in their power in France. Louis married Duchess Eleanor of Aquitaine (1122–1204) and so became duke – an advantage which had been eagerly grasped by his father, Louis VI (1081–1137), when Eleanor's father, William X, had asked of the king in his will to secure a good marriage for the young duchess. However, the marriage – and thus one avenue of Capetian aggrandisement – failed. The couple produced only two daughters, and suffered marital discord. Driven to secure the future of the house, Louis divorced Eleanor, who went on to marry Henry II of England (1133–1189). Louis married twice more before finally having a son, Philip II (1165–1223). Philip II started to break the power of the Plantagenets – the family of Eleanor and Henry II – in France. Louis VIII (1187–1226) – the eldest son and heir of Philip Augustus – married Blanche of Castile (1188–1252), a granddaughter of Eleanor of Aquitaine and Henry II of England. In her name, he claimed the crown of England, invading at the invitation of the English barons, and briefly being acclaimed – though, it would later be stressed, not crowned – as king of England. However, the Capetians failed to establish themselves in England – Louis was forced to sign the Treaty of Lambeth, which legally decreed that he had never been king of England, and the prince reluctantly returned to his wife and father in France. More importantly for his dynasty, he would during his brief reign (1223–1226) conquer Poitou, and some of the lands of the Pays d'Oc, declared forfeit from their former owners by the pope as part of the Albigensian Crusade. These lands were added to the French crown, further empowering the Capetian family. Louis IX (1214–1270) – Saint Louis – succeeded Louis VIII as a child; unable to rule for several years, the government of the realm was