Jean de Montfort was a notable figure in the late 13th and early 14th centuries, primarily recognized for his role in the War of the Breton Succession. He was born around 1285 and became the Duke of Brittany, a region in northwestern France. His claim to the duchy was contested, leading to a protracted conflict with rival factions. Montfort was known for his military leadership and strategic alliances, including support from the English crown. His efforts to secure his position were marked by battles and negotiations, ultimately shaping the political landscape of Brittany during his time. He died in 1345, leaving a legacy of resilience and determination.