Which of these emperors first made Christianity legal in the Roman Empire?

Question

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Constantine was the first Roman Emperor to issue an edict that officially tolerated Christianity. In 313 AD, he issued the Edict of Milan which granted religious toleration and freedom to all citizens of the Roman Empire, including Christians. This was a significant moment in history as it marked the beginning of the end of persecution against Christians and led to the eventual establishment of Christianity as the dominant religion of the Roman Empire.

Which of These Emperors First Made Christianity Legal in the Roman