Alfonso III of Aragon

Alfonso III the Liberal (4 November 1265 – 18 June 1291), son of Peter III and Constance of Sicily, became King of Aragon in 1285.

He moved at once against his uncle James II of Majorca, taking Majorca in 1285 and Menorca on 17 January 1287. At home he was forced to grant the Privilege of the Union to the Aragonese nobility, surrendering important royal powers.

He initially backed his brother James's claim to Sicily, but withdrew that support shortly before his death and sought peace with the papacy and France. Betrothed to Eleanor, daughter of Edward I of England, he died in Barcelona on 18 June 1291 before the marriage, aged 25.