Thus the determination of the canon of Sacred Scripture has traditionally been attributed to Gelasius.- Pope Gelasius I
Philip Schaff says that "the council of Hippo in 393, and the third (according to another reckoning the sixth) council of Carthage in 397, under the influence of Augustine, who attended both, fixed the catholic canon of the Holy Scriptures, including the Apocrypha of the Old Testament, ... This decision of the transmarine church however, was subject to ratification; and the concurrence of the Roman see it received when Innocent I and Gelasius I (A.D. 414) repeated the same index of biblical books. This canon remained undisturbed till the sixteenth century, and was sanctioned by the council of Trent at its fourth session."- Biblical canon
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The Gelasian Decree (Decretum Gelasianum) is a Latin text traditionally thought to be a Decretal of the prolific Pope Gelasius I, bishop of Rome from 492–496.
The work reached its final form in a five-chapter text written by an anonymous scholar between 519 and 553, the second chapter of which is a list of books of Scripture presented as having been made part of the biblical canon by a Council of Rome under Pope Damasus I, the bishop of Rome from 366–383.