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.
Manuel I of Portugal
Manuel thus would have had every reason to worry when he received a royal order in 1493 to present himself to the king, but his fears were groundless: John II wanted to name him heir to the throne after the death of his son Prince Afonso and the failed attempts to legitimise Jorge, Duke of Coimbra, his illegitimate son. As a result of this stroke of luck, he was nicknamed "the Fortunate".