Career
Catherine was the second child born to King Henry III of Castile and Catherine of Lancaster. The marriage was a part of an agreement by which Henry"s older brother Alfonso married Catherine"s older sister Maria and by which Henry"s sister Maria married Catherine"s brother, King John II of Castile. They did not receive all of her dowry until 1427.
Her dowry included the Dukedom of Villena.
Their marriage was childless. The Duchess of Villena died following a miscarriage in 1439.