Olivier de Blois, Count of Penthièvre count of Penthièvre (1387–1433) Parents Margaret of Clisson John I of Blois-Châtillon Children Marguerite bâtarde de Bretagne Siblings William of Blois, Count of Penthièvre Jean de l'Aigle, Viscount of Limoges Charles de Châtillon, Baron d'Avaugour Partners Isabelle of Burgundy NN Jeanne de Lalaing