A Good Question
that needs an answer. Many believe it doesn’t belong in the Bible. They don’t think it was written by John the Apostle. John Chrysostom was one of them but he was in Ephesus at the beginning of the fifth century and he had a chance to maybe look at the originals. Before this we do not know what the Apocalypse looked like. At this time Jerome was finishing the Vulgate which would become the official Bible of the Church.