The emperor Domitian, who was naturally inclined to cruelty first slew his brother, and then raised the second persecution against the Christians. In he rage he put to death some of the Roman senators, some through malice and others to confiscate the estates. He then commanded all the lineage of David to be put to death.. martyred Simeon, bishop of Jerusalem, who was crucified and St. John, who was boiled in oil, and afterward banished to Patmos.. law was made "That no Christian, once brought before the tribunal, would be exempted from punishment without renouncing his religion." If famine, pestilence, or earthquakes afflicted any of the Roman provinces, it was laid upon the Christians. Nicodemus, a benevolent Christian of some distinction, suffered at Rome. Timothy was the celebrated disciple of St. Paul, and bishop of Ephesus, where he zealously governed the church until Timothy severely reproved the procession as idolatrous, they fell upon him and beat him with clubs, expired of the bruises two days after. The apostle St. John was arrested in Rome and immersed in a cauldron of boiling oil from which he emerged unscathed.
He Sentenced John to the Island of Patmos in 95AD.
The Book of Revelations was written in 95AD, long before Rome accepted Christianity in 312 or 313AD. The Harlot of Revelation existed during Johns time. When you read about the harlot in the Book of Revelation, remember that the Roman Catholic Church did not exist at that time because Rome was still persecuting Christians just as the ancient Pharisees and Scribes did in Jerusalem. (Read how they stoned Stephen and killed James in the book of Acts).