Margaret of France, Duchess of Brabant French princess (1254-1271) (1254–1271) Parents Margaret of Provence Louis IX of France Children Siblings Philip III of France Peter, Count of Perche and Alençon Robert John Tristan, Count of Valois Blanche de France John of France Isabella of France, Queen of Navarre Louis of France Blanche of France, Infanta of Castile Agnes of France, Duchess of Burgundy Partners John the Victorious