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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Born: March 8, 1286
Died: April 30, 1341

Family

Isabella of Castile, Queen of Aragonspouse Joan of Savoyspouse Isabelle of Valois, Duchess of Brittanyspouse Arthur II, Duke of Brittanyfather Marie, Viscountess of Limogesmother Alice of Brittanysibling Beatrice of Brittanysibling Guy of Penthièvresibling John IV, Duke of Brittanysibling

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Born: March 8, 1286
Died: April 30, 1341

Family