John of Montfort was a notable figure in the 14th century, known for his role as the Duke of Brittany. Born in 1339, he became a key player in the political struggles of his time, particularly during the Brittany Civil War. His leadership was marked by efforts to unify the region and strengthen its independence. He was the son of John III, Duke of Brittany and Joan of Penthièvre. John of Montfort's legacy includes his contributions to the Breton identity and his influence on the region's governance. He passed away in 1399, leaving a lasting impact on Brittany's history.