Hearing the great sanctity of B. Sidonius, abbot near Rouen, much spoken of, he repaired to him, and received the monastic habit at his hands.
Fasting, watching, and prayer were the constant exercises of his whole life, especially during forty years that he governed his monastery.
In the incursions of the Normans in the ninth century, the monks fled for refuge to the abbey of St. Germain-des-Prez at Paris, carrying with them the relics of St. Owen, St. Turiave, St. Leufroi and St. Agofroi.
When they returned, they left in gratitude for their entertainment those of St. Leufroi and St. Turiave, which still remain in that great abbey.
St. Leufroi is named in the Roman Martyrology on the 21st of June, and honoured with an office in the new Paris Breviary.