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After Diocletian’s persecution of Christians, many of the later Roman emperors, including Constantine, saw Christianity as an ally instead of an enemy. In 313, when the only other emperor was Licinius, Constantine arranged an agreement between the two of them so that Christianity was no longer an illegal religion. This was known as the Edict of Milan. Later, in 323 when Constantine defeated Licinius to become the sole emperor, he made Christianity the preferred religion (which means he still allowed other religions, including emperor worship).