Isabelle of France was a French princess and daughter of Louis VIII of France and Blanche of Castile. She was a younger sister of King Louis IX of France and of Alfonso, Count of Poitiers, and an older sister of King Charles I of Sicily. In 1256, she founded the nunnery of Longchamp in part of the Forest of Rouvray, west of Paris. Isabelle consecrated her virginity and her entire life to God alone. She is honored as a saint by the Franciscan Order. Her feast day is 26 February.
