1525 at the Battle of Pavia, where Charles's army captured Francis I. Henry then felt there was a realistic opportunity for him to seize the French crown, to which the kings of England had long laid claim. Parliament, however, refused to raise taxes. This led Wolsey to devise the Amicable Grant, which was met with even more hostility, and ultimately led to his downfall. In 1525, after Charles V had abandoned England as an ally, Wolsey began to negotiate with France, and the Treaty of the More was signed, during Francis I's captivity, with the Regent of France—his mother, Louise of Savoy. The closeness between England and Rome can be seen in the formulation of the League of Cognac in 1526. Though England was not part of it, the League was organised in part by Wolsey with papal support. Wolsey's plan was that the League of Cognac, an alliance between France and some Italian states, would challenge Charles's League of Cambrai. This was both a gesture of allegiance to Rome and an answer to growing concerns about Charles's dominance over Europe. The final blow to this policy came in 1529, when the French made peace with Charles. Meanwhile, the French also continued to honour the "Auld Alliance" with Scotland, stirring up hostility on England's border. With peace between France and the Emperor, there was no-one to free the Pope from Charles, who had effectively held Pope Clement VII captive since the Sack of Rome (1527). There was thus little hope of securing Henry VIII an annulment from his marriage to Charles's aunt Catherine of Aragon. Since 1527, Wolsey's desire to secure an annulment for his master had dictated his foreign policy, and by 1529 none of his endeavours had succeeded. Annulment Henry's marriage to Catherine of Aragon had produced no sons who survived infancy; the Wars of the Roses were still within living memory, leading to the fear of a power struggle after Henry's death. Henry felt the people would accept only a male sovereign, not his daughter Mary. He believed God had cursed him for the sin of marrying the widow of his elder brother, and that the papal dispensation for that marriage was invalid because it was based upon the claim that Catherine was still a virgin after her first husband's death. Henry argued that Catherine's claim was not credible, and thus the dispensation must be withdrawn and