John III of Brittany
John III the Good (in Breton Yann III, in French Jean III; 8 March 1286 – 30 April 1341) 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.