Joan of France was Duchess of Brittany by marriage to John V. She was a daughter of Charles VI of France and Isabeau of Bavaria. She ruled Brittany during the imprisonment of her spouse in 1420. Wikipedia
Born: January 24, 1391, Melun, France
Died: September 27, 1433 (age 42 years), Vannes, France
Great grandchildren: Guy XVI de Laval, Isabelle de Brosse, dite de Bretagne, Catherine de Brosse, and more
Children: Peter II, Duke of Brittany, Francis I, Duke of Brittany, Isabella of Brittany, and more
Spouse: John V, Duke of Brittany (m. 1396)
Great-grandparents: John II of France, Bonne of Luxembourg, Isabella of Valois, Duchess of Bourbon, and more
Grandchildren: Margaret of Brittany, Jeanne de Laval, Guy XV de Laval, and more