Ferdinand I (Spanish: Fernando I; 27 November 1380 – 2 April 1416 in Igualada, Catalonia) called of Antequera and also the Just (or the Honest) was king of Aragon, Valencia, Majorca, Sardinia and (nominal) Corsica and king of Sicily, duke (nominal) of Athens and Neopatria, and count of Barcelona, Roussillon and Cerdanya (1412–1416). He was also regent of Castile (1406–1416).