Catherine of Castile (Castilian: Catalina de Castilla; 5 October 1422 – 10 September 1424) was suo jure Princess of Asturias and heiress presumptive to the Castilian throne all her life.
Catherine was born on 5 October 1422 in Illescas, Toledo.[1] She was the first child of King John II of Castile and his first wife, Maria of Aragon.[2] Named after her grandmother, Catherine of Lancaster, she immediately became heiress presumptive to the throne of Castile upon her birth.[3] The Infanta was formally recognized as successor to the throne of the kingdom and sworn in as Princess of Asturias in early 1423 by the Cortes in Toledo.[4]
Not much is known about Catherine's life.[5] She died of an unknown illness in Madrigal de las Altas Torres on 10 September 1424.[6] Her younger sister, Infanta Eleanor, replaced her as heiress and Princess of Asturias.[7] Infanta Catherine is buried in Miraflores Charterhouse, along with her father and stepmother, Isabella of Portugal.