Duke John of Braganza was a Portuguese nobleman born in 1430. He was a member of the House of Braganza, which played a significant role in Portuguese history. John became the Duke of Braganza in 1484 and was known for his wealth and influence, particularly in the Alentejo region of Portugal. He was a key figure during the late 15th century, navigating the complex political landscape of the time. John was also the grandfather of King John III of Portugal, who ruled from 1521 to 1557, further solidifying the Braganza family's prominence in Portuguese royalty.