How did early Christians use the name Babylon as a code for Rome?

In early Christian tradition, the name "Babylon" served as a powerful, coded metaphor for Rome, particularly within apocalyptic literature like the Revelation to John.1

This usage was rooted in the historical memory of the Babylonian Exile, where the ancient city of Babylon had already been established in the Hebrew Bible as a quintessential symbol of imperial evil and an enemy of God’s people. By adopting this imagery, early Christians identified Rome as a present, oppressive threat that mirrored the wickedness of the ancient city.12

The metaphor was highly adaptable:
* Symbolism of Evil: Just as ancient Babylon was depicted as a "whore" that corrupted the "kings of the earth," Rome was viewed as a center of idolatry and persecution that stood in direct opposition to the Christian faith.1
* Visual Cues: The "seven heads" of the beast associated with the "whore of Babylon" in Revelation were widely understood to represent the Seven Hills of Rome.1
* Eschatological Hope: By labeling Rome as Babylon, Christians framed the empire as a pagan power destined for divine destruction, reinforcing their belief in the eventual triumph of the Kingdom of God.1