John of Brittany was a nobleman born around 1286, known for being the Duke of Brittany. He was the son of John II, Duke of Brittany and Beatrice of England. His life was marked by political struggles and alliances, particularly during the conflicts between the English and French crowns. John became involved in the Hundred Years' War, aligning with the English side at times. He was also known for his efforts to maintain the independence of Brittany. John of Brittany passed away in 1341, leaving a legacy tied to the complex history of medieval France and Britanny.