Manuel I of Portugal – Wikipedia

Manuel was born in Alcochete on 31 May 1469, the ninth child of Ferdinand, Duke of Viseu and Beatriz of Portugal.His father, Ferdinand, was the son of Duarte, King of Portugal and the brother of Afonso V of Portugal, while his mother, Beatriz, was granddaughter of King John I of Portugal.In addition, his sister Eleanor of Viseu was the wife of King John II of Portugal.

https://en.wikipedia.org/wiki/Manuel_I_of_Portugal