This work applies various types of criticism (source, form, redaction, historical) to the interpretation of the text. Typology and psycho-history are also used. The study first examines Gregory, the man and the scholar. The interpretation of the "Vita V. Benedicti" is in continuous form. An epilogue reviews the material as a whole to determine what exactly the hagiographer had in mind when he undertook the writing of the life of Benedict.