Hvem daterede Beltrán de la Cueva, 1st Duke of Alburquerque?

Beltrán de la Cueva y Alfonso de Mercado, 1st Duke of Alburquerque (c. 1443 – 1 November 1492) was a Spanish nobleman who is said to have fathered Joanna, the daughter of Henry IV of Castile's wife Joan of Portugal. His alleged daughter, called "la Beltraneja", was deprived of the crown of Castile because of the uncertainty regarding her parentage.

Juana de Portugal o de Avís (Almada, 20 de marzo de 1439​-Madrid, 13 de junio de 1475​) fue infanta de Portugal y reina de Castilla como la esposa del monarca Enrique IV.