 João de Lencastre, 1st Duke of Aveiro

João de Lencastre (1501 – 1571 in Coimbra), was the older son of Infante George, Duke of Coimbra and of his wife "Dona" Beatriz of Vilhena.Through his father, John was a grandchild of King John II of Portugal and a 3rd cousin to King Manuel I of Portugal.