John II of Montfort was a French nobleman born in the late 13th century, known for his role in the War of the Breton Succession. He was the son of John I of Montfort and became the Duke of Brittany after his father's death. His claim to the duchy was contested by the House of Blois, leading to a prolonged conflict. During his reign, John II faced numerous challenges, including political intrigue and military confrontations. He was a key figure in the struggle for control over Brittany, navigating alliances and rivalries until his death in 1345, which left a significant impact on the region's history.