Jean II of Brittany was a notable duke who ruled from 1341 to 1372. He was born in 1339 and became duke after a period of conflict over the succession of the duchy. His reign was marked by the Breton War of Succession, a struggle for power that involved various factions and external influences, including the Kingdom of France and the Kingdom of England. During his rule, Jean II worked to strengthen the duchy's independence and consolidate power. He was known for his efforts to maintain peace and stability in Brittany, navigating complex political alliances. His legacy includes contributions to the cultural and political landscape of the region, which would influence future generations.