Alfonso I, Duke of Gandia

Alfonso de Aragón y Foix (1332 - Gandia, 5 March 1412) also called Alfonso I of Gandía "the old" and Alfonso IV of Ribagorza, was the eldest son of Count Peter of Ribagorza and Juana of Foix. He was the grandson of James II of Aragon and cousin of Pedro IV "the Ceremonious".