The kingdom formed by the union of Aragón and Catalonia was the first to complete that portion of the Reconquest which the geographical conditions assigned to it; then it directed its strength eastward. Peter II, the Catholic, sovereign of Aragón and Catalonia, went to Rome to seek the annulment of his marriage with Maria of Montpellier, and to have himself crowned by the pope. The former purpose he failed to accomplish; the latter occasioned him a great deal of trouble, as the Aragónese nobles refused to recognize the position of vassalage to the Holy See in which Peter had placed his kingdom. These nobles then forced for the first time that union, or confederation, which was the cause of such serious disturbances until Peter IV with his dagger cut in pieces the document which recorded it. Peter II, the Catholic, fell in the Battle of Muret (1213), defending his Albigensian kinsmen against Simon de Montfort, whom Innocent III had sent against them. His son, James I, the Conqueror, completed the Catalan-Aragónese Reconquest, winning Majorca (1228) and Valencia (1238) besides helping his son-in-law, Alfonso X, the Wise, to complete the conquest of Murcia. His son and successor gave a new direction to Catalan-Aragónese policy by enforcing the rights of his wife, Constance, to the kingdoms of Sicily and Naples. Profiting by the rising of the Sicilian Vespers against the Angevins (1282), he possessed himself of Sicily and attacked Naples.