Duke of Aveiro (Portuguese: Duque de 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 of Portugal. John of Lencastre was already Marquis of Torres Novas when the King granted him the new title of Duke of Aveiro.
Duke of Aveiro (Portuguese: Duque de 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 of Portugal. John of Lencastre was already Marquis of Torres Novas when the King granted him the new title of Duke of Aveiro.
Source: Wikipedia "Duke of Aveiro" · CC BY-SA 4.0
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