Pope St. Gelasius I (image source)
Gelasius was born in Rome, in the fifth century, the son of an African named Valerius. Later, ordained a priest, he was elected Pope on March 1st, 492. Gelasius had a reputation for learning, justice, holiness, and charity. However, he was burdened with difficulties caused by a conflict with Euphemius, the Patriarch of Constantinople, over the Acacian heresy. He also protested the encroachments by Constantinople on Alexandria and Antioch. Gelasius was influential in setting aside Roman pagan festivals. Moreover, in opposition to the Manichaeans, he ordered reception of the Eucharist under both species. Gelasius is known to have composed liturgical Prefaces and Orations for Sacramentaries, which may be part of the Leonine Sacramentary. However, he had nothing to do with the Gelasian Sacramentary or the Gelasian Decree (listing the Canonical books of the Bible) – which have been erroneously attributed to him. He died at Rome on November 21, 496.
Source: Saints & Angels