Battle of Alcácer Quibir
Teodósio I's first son, Jaime of Braganza, died before he could inherit his father's titles, fighting alongside King Sebastião I at the Battle of Alcácer Quibir. The Duke's only daughter, Isabel of Braganza, married Miguel Luis de Meneses, 1st Duke of Caminha, though their union had no issue. Teodósio I's last child and successor, João I, lived a very different life from Teodósio I's calm and relatively peaceful tenure, having been involved in the controversies of the Portuguese succession crisis of 1580 and the subsequent War of the Portuguese Succession.