list of saints in the Nobis quoque were added to the Roman Canon of the Mass under "a mixed influence of Antioch and Alexandria", and that "St. Leo I began to make these changes; Gregory I finished the process and finally recast the Canon in the form it still has." Fortescue concluded: We have then as the conclusion of this paragraph that at Rome the Eucharistic prayer was fundamentally changed and recast at some uncertain period between the fourth and the sixth and seventh centuries. During the same time the prayers of the faithful before the Offertory disappeared, the kiss of peace was transferred to after the Consecration, and the Epiklesis was omitted or mutilated into our "Supplices" prayer. Of the various theories suggested to account for this it seems reasonable to say with Rauschen: "Although the question is by no means decided, nevertheless there is so much in favour of Drews's theory that for the present it must be considered the right one. We must then admit that between the years 400 and 500 a great transformation was made in the Roman Canon" (Euch. u. Busssakr., 86). In the same article Fortescue went on to speak of the many alterations that the Roman Rite of Mass underwent from the 7th century on (see Pre-Tridentine Mass), in particular through the infusion of Gallican elements, noticeable chiefly in the variations for the course of the year. This infusion Fortescue called the "last change since Gregory the Great" (who died in 604). The Eucharistic Prayer normally used in the Byzantine Rite is attributed to Saint John Chrysostom, who died in 404, exactly two centuries before Pope Gregory the Great. The East Syrian Eucharistic Prayer of Addai and Mari, which is still in use, is certainly much older. Liturgy and traditions Roman Missal The Roman Missal () is the liturgical book that contains the texts and rubrics for the celebration of the Mass in the Roman Rite of the Catholic Church. Before the high Middle Ages, several books were used at Mass: a Sacramentary with the prayers, one or more books for the Scriptural readings, and one or more books for the antiphons and other chants. Gradually, manuscripts came into being that incorporated parts of more than one of these books, leading finally to versions that were complete in themselves. Such a book was referred to as a Missale Plenum (). In response