According to the Vatican he was born in Africa, though born Roman, therefore born in Roman Africa before the invasion of the Vandals.[1][2]
He was elected pope on 1 March 492 inheriting the conflicts of Pope Felix III with the Eastern Roman Emperor Anastasius and the Patriarch of of Constantinople. Regarding the Acacian schism, Pope Gelasius wrote a book De duabus in Christo naturis (On the dual nature of Christ) describing the Catholic doctrine on this matter. He lived at a time that was the cusp of Late Antiquity and the Early Middle Ages.[2]
During the Acacian schism, Gelasius advocated the primacy of the See of Rome over the universal Church, both East and West, and presented his doctrine in terms that became the model for successive popes, who also claimed papal supremacy because of their succession to the papacy from the first supreme pontiff, Peter the Apostle.[2]
Gelasius was responsible for the suppression of the ancient Roman festival Lupercalia, an annual festival held on February 15th to purify the city, and promote health and fertility [3].
He was a prolific author with over 100 letters surviving and 6 treatises are extant that bear the name of Gelasius.[2]
Gelasius was the third and final pope to hail from North Africa, though he was, at the same time, a Roman citizen. He was a particularly gifted writer, having been charged with compiling church documents for his predecessor, Felix III, and (once he was pope) was in fact the most prolific of the early popes. Many letters and miscellaneous letter fragments written by Gelasius I still exist and can be found in the Vatican archives.
"There are two powers by which chiefly this world is ruled: the sacred authority of the priesthood and the authority of kings. And of these the authority of the priests is so much the weightier, as they must render before the tribunal of God an account even for the kings of men." - Pope St. Gelasius I
Gelasius was only in office for a short time, having ruled little more than three and a half years at his death on November 19, 496. His feast day is November 21.
Gelasius had to deal with the Acacian Schism, which still divided the East and West over the correct teaching on the nature of Christ. Presumably fed up with the nonsense, Gelasius didn’t shy away from writing in distinct, and sometimes severe, tones in an effort to get his point across. His writings and teachings covered things like the supremacy of the pope over the whole Church, the Manichean heresy, the abolition of a pagan festival called the “Lupercalia,” and (as we read above) the proper understanding of the relation between church and state. On papal supremacy in particular, it’s generally understood that Gelasius’ writings on the primacy of the Chair of Peter were the Catholic Church's strongest arguments in favor of it for many centuries.
Pope Gelasius I is the man to thank for the veneration of one of the Church’s most storied saints. In 494, Gelasius is said to have canonized St. George, the legendary dragon-slayer, noting that he was one of many saints "whose names are justly reverenced among men, but whose actions are known only to God."
At this time, Clovis I, the king of the Franks, was baptized at Rheims just a month after the death of Gelasius I, on Christmas Day 496. His choice of Catholicism over Arianism, along with the Frankish kingdom becoming what we now know as France, is the primary reason France is known as “The Eldest Daughter of the Church.”
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