Alfonso III, 1265–91, king of Aragón and count of Barcelona (1285–91), son and successor of Peter III. He was forced to grant wide privileges to the cortes of the Aragonese nobles. At first he supported the claim to Sicily of his brother James (later James II of Aragón) against Charles II of Naples. Later, however, he recognized papal suzerainty over Sicily and pressed James to abandon his claim. He also made war on Castile and on his uncle, James I of Majorca. James II succeeded him.
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