Manuel I of Portugal
Manuel's mother was the granddaughter of King John I of Portugal, whereas his father was the second surviving son of King Edward of Portugal and the younger brother of King Afonso V of Portugal. In 1495, Manuel succeeded his first cousin, King John II of Portugal, who was also his brother-in-law, as husband to Manuel's sister, Eleanor of Viseu.
Hermenegildo Capelo
Hermenegildo Capelo later rose to become aide-de-camp to King Luis I of Portugal and afterwards to King Carlos I and, later still, vice-admiral. His military career ended in 1910 when King Manuel II of Portugal was exiled.