Leutfridus was a 7th-century French Benedictine monk who lived in the region of Évreux. After studying at Condat Abbey and Chartres, he became a spiritual follower of Saint Sidonius of Saint-Saëns. He practiced asceticism as a hermit in Cailly and Rouen before establishing a monastic community. This foundation, known as La Croix-Saint-Qu'en, was later renamed Saint-Leufroy to honor his leadership. He served as the monastery's first abbot for forty years until his death in 738.