He was Roman Emperor from 306-337 CE, becoming the first Emperor to convert to Christianity.

The Roman Emperor who reigned from 306-337 CE and is known as the first Emperor to convert to Christianity is Constantine the Great.

The statement is correct, the Roman Emperor referred to is Constantine the Great. He ruled as Emperor of the Roman Empire from 306 to 337 CE. Constantine is known for his conversion to Christianity and for being the first Roman Emperor to promote and establish Christianity as the favored religion of the empire. His conversion, as well as the Edict of Milan in 313 CE, which granted religious tolerance to Christians, had a significant impact on the spread of Christianity and the subsequent rise of the Christian Church.

The Roman Emperor you are referring to is Constantine the Great. To find this answer, one can either have prior knowledge or use various resources to gather information.

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By utilizing these methods, you can find the answer to your question and gain a better understanding of the historical context and significance of Constantine the Great as the first Roman Emperor to convert to Christianity.