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Beltrán de la Cueva, 1st Duke of Alburquerque

Beltrán de la Cueva, 1st Duke of Alburquerque

Beltrán de la Cueva y Alfonso de Mercado, 1st Duke of Alburquerque was a Spanish nobleman who is said to have fathered Joanna, the daughter of Henry IV of Castile's wife Joan of Portugal. Wikipedia