The good folk at Wikipedia set today in 312 as the moment when Constantine, later called the Great, purported to have a vision of a cross in the sky and heard the words “With this sign, conquer.”
What we know with certainty is that he did.
And this also sealed the deal for Christianity. Already an important cult with a significant following, it would within a few years become the official religion of the Empire.
Sort of cutting a deal with the devil…
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