Isabella of France, Queen of Navarre daughter of Louis IX (1241–1271) 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 Agnes of France, Duchess of Burgundy Margaret of France, Duchess of Brabant Blanche of France, Infanta of Castile Louis of France Partners Theobald II of Navarre