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.
Mateus Fernandes
He became master of works at the monastery of Batalha in 1490 or slightly earlier, during the reign of king John II of Portugal. Before this date, nothing is known of his private life, as he has left no records to consult other than his architectural marvels. He succeeded the architect Fernão de Évora as architect of the monastery. Mateus Fernandes later became the primary architect of the next king, Manuel I of Portugal, who made him the supervisor of other architectural works in the rest of the country.