The Roman empire became Christian during the fourth century CE. At the century's start, Christians were – at most – a substantial minority of the population. By its end, Christians (or nominal Christians) indisputably constituted a majority in the empire. Tellingly, at the beginning of the century, the imperial government launched the only sustained and concerted effort to suppress Christianity in ancient history – and yet by the century's end, the emperors themselves were Christians, Christianity enjoyed exclusive support from the state and was, in principle, the only religion the state permitted.
Apart from the small and ethnically circumscribed exception of the Jews, the ancient world had never known an exclusivist faith, so the rapid success of early Christianity is a historical anomaly. Moreover, because some form of Christianity is a foundational part of so many peoples' lives and identities, the Christianisation of the Roman empire feels perennially relevant – something that is ‘about us' in a way a lot of ancient history simply is not. Of course, this apparent relevance also obscures as much as it reveals, especially just how strange Rome's Christianisation really was.
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