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.
Descendants of Manuel I of Portugal
Once Manuel heard a royal order was on its way to him, he initially thought it to be a summons for a trial, and likely execution, and Manuel worried. However, when the order reached Manuel, he was greatly relieved as the order made Manuel the heir to John II's throne.