Constantine I the Great, 307-337 AD. Bronze Follis.

Flavius Valerius Constantinus, Constantine the Great, was the son of Helena and the First Tetrarchic ruler Constantius I. Constantine is most famous for his conversion to Christianity after the battle of the Milvian Bridge where he defeated emperor Maxentius. Before the battle, he saw the words "In Hoc Signo Victor Eris" (By this sign you shall conquer) emblazoned on the sun around the Chi Rho, the symbol of Christianity. After placing this Christogram on the shields of his army, he defeated his opponent and thus ruled the empire through divine providence. He also shifted the capital of the empire to Constantinople, establishing the foundation for an Empire that would last another 1000 years. He died in 337 and his sons divided the Roman territories.

Constantine I The Great, 307-337 AD.

Everyone knows one thing about Constantine: he was the first Christian Roman emperor. His decision to embrace Christianity certainly had a profound effect on the history of western Europe. But how did it affect Christians living outside of the Roman Empire?

Constantine the Great - Wikipedia

Divus Constantine I the Great, post-mortem issue struck after his death, 337-340 AD.