Feastday: February 26
Sister of St. Louis and daughter of King Louis VIII of France and Blanche of Castile, she refused offers of marriage from several noble suitors to continue her life of virginity consecrated to God. She ministered to the sick and the poor, and after the death of her mother, founded the Franciscan Monastery of the Humility of the Blessed Virgin Mary at Longchamps in Paris. She lived there in austerity but never became a nun and refused to become abbess. She died there on February 23, and her cult was approved in 1521.