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Christianity conquered the Roman Empire. It catapulted from a persecuted mystery cult, viewed as a threat to the pagan ritualistic pantheon, to a turning point of victories over Rome's traditional religion. National Geographic unravels how the Christians infiltrated, endured and overran Rome; from the earliest martyrs to the first Christian empire, see how they spread their message.

Watch the full National Geographic When Rome Ruled Rise of Christianity movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.