Complete independence from Alfonso VII of León's suzerainty, however, could not be achieved by military means alone. The County of Portugal still had to be acknowledged diplomatically by the neighboring lands as a kingdom and, most importantly, by the Catholic Church and the pope. Afonso wed Mafalda of Savoy, daughter of Count Amadeus III of Savoy, and sent ambassadors to Rome to negotiate with the pope. He succeeded in renouncing the suzerainty of his cousin, Alfonso VII of León, becoming instead a vassal of the papacy, as the kings of Sicily and Aragon had done before him.