Dom João I of Braganza was the 6th Duke of Braganza and 1st Duke of Barcelos, among other titles. He is known for pushing the claims of his wife, Infanta Catherine of Portugal, to the throne of Portug

Duke of Aveiro was a Portuguese title of nobility, granted in 1535 by King John III of Portugal to his 2nd cousin, John of Lencastre, son of Infante George of Lencastre, a natural son of King John II