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
Teodósio I, Duke of Braganza Teodósio I, Duke of Braganza Dom Teodósio I of Braganza (; 1510 – 22 September 1563) was the 5th Duke of Braganza, among other titles. He is known for ceding the title of Duke of Guimarães to Infante Duarte of Aviz, alongside some of the wealth and properties of the House of Braganza. The Duke Teodósio I was an educated and refined man, a typical renaissance prince. He loved painting and sculpture. In 1542, he married his 1st cousin (1513–1558), daughter of his uncle Dinis, and had John I of Braganza. Their child, João I succeeded him as 6th Duke