He was born at Montemor-o-Velho, and became a knight of the Order of Aviz in the service of the Infante Dom Pedro, son of the Regent Infante Peter, Duke of Coimbra. After Peter's defeat and death in the battle of Alfarrobeira (1449), he accompanied his master into exile. In 1458, he fought on the side of Afonso V in the conquest of Alcácer-Ceguer in Morocco. He received several honours and became a counselor of the king. During the War of the Castilian Succession, he participated in the recapture of the town of Alegrete from the Castilians. He was injured in the leg during this engagement.