John V, Duke of Brittany Duke of Brittany (1339–1399) Parents Joanna of Flanders John IV, Duke of Brittany Children Marie of Brittany, Lady of La Guerche Margaret of Britain Richard, Count of Étampes Arthur III, Duke of Brittany John V Jeanne de Bretagne Blanche of Brittany Siblings Joan of Brittany, Baroness of Drayton Partners Mary of Waltham Joan of Navarre Joan Holland, Duchess of Brittany
