Through a formal document dated 4 April 1422, his maternal grandfather, the ConstableNuno Álvares Pereira, granted to him the County of Ourém. However, this grant only gained the Portuguese King Edward's royal confirmation on 24 November 1433.
In a document issued on 11 October 1451, King Afonso V of Portugal granted him the title of Marquis of Valença. He was the first Portuguese nobile to be made a Marquis.
In 1458, Alphonse took part in the Portuguese expedition to north Africa which led to the capture of the Moroccan city of Alcácer Ceguer (Al Qsar as-Seghir).
Alphonse had a natural son with Dona Beatriz de Sousa (it is said that they were secretly married). This son, Afonso de Portugal, was required to join the clergy by King John II of Portugal. Afonso de Portugal was appointed Bishop of Évora. He had a natural son named Francisco de Portugal (Francis of Portugal) who was later appointed as Francis I, 1st Count of Vimioso, from whom Counts of Vimioso descend.
Generations indicate descent from Afonso, Duke of Braganza, founder of the House of Braganza, until João II, Duke of Braganza, the first Braganza monarch of Portugal; italics indicate a head of the House
Generations indicate descent from John IV, King of Portugal, formerly John II, Duke of Braganza, the first Braganza monarch of Portugal, until Manuel II, King of Portugal, the last monarch of Portugal, excluding the Miguelist line; italics indicate a head of the House
