Marie of Brittany, Countess of Saint-Pol French noblewoman (1268–1339) Parents Beatrice of England John II, Duke of Brittany Children Eléonore de Châtillon Béatrix de Châtillon Isabeau de Châtillon John, Count of Saint-Pol Marie de St Pol Jeanne de Châtillon Mahaut of Châtillon Siblings Eleanor of Brittany Arthur II, Duke of Brittany John of Brittany, Earl of Richmond Blanche of Brittany Henry de Dreux Pierre de Dreux, Comte de Léon Partners Guy IV, Count of Saint-Pol