Isabella of Braganza (October 1402 – 26 October 1466), also known as Isabella of Barcelos (her father was originally the 8th Count of Barcelos). She was the daughter of Afonso, 1st Duke of Braganza and Beatriz Pereira de Alvim, she married Infante João, Lord of Reguengos de Monsaraz, her half-uncle, son of John I of Portugal.