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
Stone memorial of Aveiro's shame in Belém, Lisbon.
Dom Teodósio I of Braganza 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 propertie