Ferdinand I of Aragon

Ferdinand I (1380–1416), called Ferdinand of Antequera and the Just, was the younger son of John I of Castile and Eleanor of Aragon. From 1406 he was regent of Castile for his nephew John II, and in 1410 he took Antequera from Granada.

When his uncle Martin I of Aragon died without surviving legitimate offspring, the Compromise of Caspe chose Ferdinand king in 1412, making him the first Castilian ruler of the Crown of Aragon.

In 1416 he helped end the Western Schism by abandoning Antipope Benedict XIII. He died at Igualada on 2 April 1416.