After his father died, he was declared Augustus at Eboracum, England.
After his father died, he was declared Augustus at Eboracum, England. While absent from the East, he had his wife Fausta and his son Crispus slain. This ruler defeated his co-emperor Licinius at the Battle of Hellespont and the Battle of Chrysopolis, thus ending the Tetrarchy period. His namesake arch was constructed after a battle in which Maxentius drowned in the Tiber, the battle of Milvian Bridge. Regarding that battle, Eusebius describes a vision of a flaming cross coming to this ruler. FTP, name this Roman emperor whose mother was St. Helena, who issued the mandate for Christian tolerance in the Edict of Milan, and was the first Roman ruler to convert to Christianity.
After his father died, he was declared Augustus at Eboracum, England.
Flavius Valerius {Constantine I} the Great [or {Constantine the Great}; or {Constantinus I}; or {Constantinus the Great}; Prompt on {Constantine}]