Constantine was a Roman Emperor who reigned from 306 to 337 AD. He was born in the city of Rome and later moved to the city of Nish, which is now known as Niš in Serbia. He married Helena, who was the mother of his son, Crispus. He also married Fausta, who was the mother of his three sons, Constantine II, Constantius II, and Constans. He was a follower of Shia Islam and was baptized by Pope Sylvester I in DCCIX (809). He was exiled to the city of Pola in modern-day Croatia in 337 AD.