Juan Manuel, Prince of Villena
She was the daughter of Juan Manuel, Prince of Villena (1282–1348) and his second wife Blanca Núñez de Lara de La Cerda. Her mother Blanca (d. 1347) was a descendant of the lords of Biscay and of Lara and of Alfonso X's eldest son, Fernando de la Cerda. She was the last legitimate member of the House of Ivrea.