House of Braganza of Alcácer Quibir, alongside the King and his uncle, Jaime of Braganza, at the age of ten. Teodósio II later pledged his allegiance and became a faithful countryman to the Philippine Dynasty, having even defended Lisbon against King Philip I's rival claimant to the throne, António, Prior of Crato, who had been acclaimed, by his supporters, as King António I of Portugal. In recognition for his military prowess, Teodósio II was made Constable of Portugal. The Duke's support and service to the Philippine Dynasty, earned the Braganzas more lands and titles and, by 1640, the House had amassed around 80,000
Fernando II, Duke of Braganza focused on diminishing the powers of the two most powerful noble houses in the kingdom, House of Beja and Viseu and the House of Braganza. King John II accused his first cousin, Diogo I of Beja and Viseu (brother-in-law of Fernando II), of high treason and had him brutally executed. Soon after, the King also accused his second half-cousin, Fernando II of Braganza, of high treason and had him executed at Évora in 1483. Afterwards, the assets of the House of Braganza were confiscated and the family fled to Castile. The family returned in 1498 and had all their property