The Roman army was reorganized to consist of mobile units ( comitatenses) and garrison troops ( limitanei) which were capable of countering internal threats and barbarian invasions. To combat inflation, he introduced the solidus, a new gold coin that became the standard for Byzantine and European currencies for more than a thousand years. He restructured the government, separating civil and military authorities. Upon his ascension, Constantine enacted numerous reforms to strengthen the empire. He eventually emerged victorious in the civil wars against emperors Maxentius and Licinius to become the sole ruler of the Roman Empire by 324. After his father's death in 306, Constantine was acclaimed as imperator by his army at Eboracum ( York, England). He began his career by campaigning in the eastern provinces (against the Persians) before being recalled in the west (in AD 305) to fight alongside his father in the province of Britannia. Constantine served with distinction under the Roman emperors Diocletian and Galerius. Later canonized as a saint, she is traditionally attributed with the conversion of her son.

His mother, Helena, was a Greek woman of low birth and a Christian. Born in Naissus, Dacia Mediterranea (now Niš, Serbia), he was the son of Flavius Constantius, a Roman army officer of Illyrian origin who had been one of the four rulers of the Tetrarchy. He was the first emperor to convert to Christianity. 272 – 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337. Constantine I ( / ˈ k ɒ n s t ən t aɪ n/ KON-stən-tyne, also / ˈ k ɒ n s t ən t iː n/ KON-stən-teen Latin: Flavius Valerius Constantinus, Classical Latin: Greek: Κωνσταντῖνος, translit.

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