John I of Blois-Châtillon (1345-1404) (1345–1404) Parents Charles, Duke of Brittany Joan, Duchess of Brittany Children William of Blois, Count of Penthièvre Olivier de Blois, Count of Penthièvre Charles de Châtillon, Baron d'Avaugour Jean de l'Aigle, Viscount of Limoges Siblings Marie of Blois, Duchess of Anjou Margaret of Châtillon Partners Margaret of Clisson
