John III, duke of Brittany (born 1286)

John III, Duke of Brittany

Duke of Brittany from 1312 to 1341

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…