Afonso III of Portugal
Amador Vaz de Alpoim was married in the Azores to Margarita Cabral de Melo, daughter of Matias Nunes Cabral and Maria Simões de Melo, belonging to a noble family, among whose numerous ancestors are found Martim Afonso de Melo and Briolanja de Sousa, a direct descendant of Afonso III of Portugal.