John III, Duke of Brittany
Duke of Brittany · France · On the map · Lived 1286 to 1341 · aged 55
John III the Good was Duke of Brittany, from 1312 to his death and 5th Earl of Richmond from 1334 to his death. He was the son of Arthur II, Duke of Brittany, and his first wife Marie, Viscountess of Limoges. John was strongly opposed to his father's second marriage to Yolande and attempted to contest its legality.
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