sisters, Margaret (Louis IX's wife) and Eleanor (the wife of Henry III of England), to believe that they had been unlawfully disinherited. Their mother, Beatrice of Savoy, claimed that Raymond Berengar had willed the usufruct of Provence to her. The Hohenstaufen Emperor Frederick II (whom Pope Innocent IV had recently excommunicated for his alleged "crimes against the Church"), Count Raymond VII of Toulouse and other neighbouring rulers proposed themselves or their sons as husbands for the young Countess. Her mother put her under the protection of the Holy See. Louis IX and Margaret suggested that Beatrice should be given in marriage to Charles. To secure the support of France against Frederick II, Pope Innocent IV accepted their proposal. Charles hurried to Aix-en-Provence at the head of an army to prevent other suitors from invading Provence, and married Beatrice on 31January 1246. Provence was a part of the Kingdom of Arles and so of the Holy Roman Empire, but Charles never swore fealty to the emperor. He ordered a survey of the counts' rights and revenues, outraging both his subjects and his mother-in-law, who regarded this action as an attack against her rights. Being a younger child, destined for a church career, Charles had not received an appanage (a hereditary county or duchy) from his father. Louis VIII had willed that his fourth son, John, should receive Anjou and Maine upon reaching the age of majority, but John died in 1232. Louis IX knighted Charles at Melun in May 1246 and three months later bestowed Anjou and Maine on him. Charles rarely visited his two counties and appointed baillies (or regents) to administer them. While Charles was absent from Provence, Marseilles, Arles and Avignonthree wealthy cities, directly subject to the emperorformed a league and appointed a Provençal nobleman, Barral of Baux, as the commander of their combined armies. Charles's mother-in-law put the disobedient Provençals under her protection. Charles could not deal with the rebels as he was about to join his brother's crusade. To pacify his mother-in-law he acknowledged her right to rule Forcalquier and granted a third of his revenues from Provence to her. Seventh Crusade In December 1244 Louis IX took a vow to lead a crusade. Ignoring their mother's strong opposition, his three brothersRobert, Alphonse and Charlesalso took the cross. Preparations for the crusade lasted for years, with the crusaders embarking at Aigues-Mortes on 25August 1248. After spending