What makes you say that? The Catholic scholar Jerome translated the Latin Vulgate directly out of the Hebrew and Greek. "He originally translated it all from Greek, but as he went on he corrected the Old Testament against the Hebrew original." But at the same time the Vulgate was ruined because his pope insisted that seven apocryphal books be included within the canon and treated as a second canon.
No Catholic Church in the fourth century. You are too early for Papal authority or any other doctrine of the Catholic Church.
The word
pope derives from
Greek πάππας (
'páppas'), meaning 'father'. In the early centuries of Christianity, this title was applied, especially in the East,
to all bishops[18] and other senior clergy, and
later became reserved in the West to the bishop of Rome during the reign of Pope Leo I (440–461),[19] a reservation made official only in the 11th century.
[20][21][22][23][24] (wikipedia)
Jerome translated the Koine Greek into Latin many decades before the first, titled, POPE Leo took to the stand.
The Great church schism occurred in the eleventh century after the Roman Church. Enacted church legislation proclaiming universal Papal authority.
There was no Pope when Jerome was translating, only bishops.