If we are to credit a 9th century biographer, Gregory abbreviated and otherwise simplified the Sacramentary of Gelasius, producing a revised edition with which his own name has become associated, and which represents the groundwork of the modern Roman Missal.
The Sacramentary of Serapion (c. 350), The Pilgrimage of Etheria (Silvia) (c. 385), and The Catechetical Lectures of Cyril of Jerusalem (348) are also of value in this connexion.
The addition of some words in the prayer Hanc igitur, the recitation of the Pater Noster at the end of the Canon immediately before the fraction of the bread, and the chanting of the Allelulia after the Gradual at other times besides the season of Easter) and two others in the ceremonial connected therewith (forbidding deacons to perform any musical portion of the service except the chanting of the gospel, and subdeacons to wear chasubles), neither the external nor the internal evidence appears to warrant belief that the Gregorian Sacramentary is his work.
The sacramentary of Serapion, c. 350, provides a prayer asking that the divine Word may descend into the water and hallow it, as of old it hallowed the Jordan.
The epistles of Pope Siricius (who wished to stand well with the people) are full of scorn for these ascetics, and the Leonine sacramentary contains prayers which severely denounce them.