Who was the first Christian emperor?

Answer 1

If the intent of this question is to ask who was the first Christian Emperor of Rome, then the following are answers:

• Constantine I the Great is the first Roman Emperor known to have been baptized.
• It is possible that Philip the Arab was baptized, as it is understood that he was tolerant toward Christians and there is an account saying he was Christian recorded by Eusebius. This is not regarded as firmly historic, however.

There are accounts of monarchs of other countries being baptized early on, and one of these was the Askumite king Ezana II, who is said to have been baptized in about 324 AD. While there are other monarchs who are said to have been baptized earlier, they are called kings, and there is no one calling them emperor, which is a title given to Ezana.

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Answer 2

Constantine - First Christian Emperor of Rome (285-337 CE)