Who was XXX's paternal figure?
Duarte of Portugal, 4th Duke of Guimarães
Duarte of Portugal, 4th Duke of Guimarães (October 7, 1515 in Lisbon -- September 20, 1540 in Lisbon) was a Portuguese infante (prince); the sixth son of King Manuel I of Portugal and his wife Maria of Aragon.
Manuel I of Portugal