John of Lencastre, 1st Duke of Aveiro 1st Duke of Aveiro (1501–1571) Parents Britez de Villena-Melo Jorge de Lencastre, 2nd Duke of Coimbra Children George of Lencastre, 2nd Duke of Aveiro Siblings Afonso de Lencastre Luiz I de Lancastre Partners Juliana de Lara