What is XXX's father's name?
Luís of Portugal, Duke of Beja
Infante Luís of Portugal, Duke of Beja (3 March 1506, in Abrantes -- 27 November 1555, in Marvila, in Lisbon) was the second son of King Manuel I of Portugal and his second wife Maria of Aragon (the third daughter of the Catholic Monarchs).
Manuel I of Portugal