Flavius Valerius Aurelius Constantinus [s] (s. On February 27, about 280  – died on May 22, 337), commonly known as Constantine I, Constantine the Great or St. Constantine (for believers) Eastern Orthodox Christians, were Roman emperors from 306 until they died. Alexa Write My IEP Teacher shirt. Constantinus I was the first Roman king to convert to Christianity and was the one who issued the Milano Ordinance to end the massacre of Christians in the whole empire. Constantine I was the son of Constantius Chlorus, having succeeded in York (England today) after his death in 306.  He was the first leader in Western history to implement a policy of religious freedom; but in fact, Constantine was a pious Christian and always believed in God’s providence in defeating domestic opposition and strengthening his power.
The Byzantium liturgical calendar, kept by the Eastern Orthodox Church and Eastern Catholic churches, lists Constantine I and his mother Helena as Saints. Although not included in the list of Saints of the Latin Catholic Church (Western), Constantine I was respected with the title “Great” for his contributions to Christianity. Many Christian Catholics regard Constantine I with Jesus and Paul as the three most important figures in the establishment and development of the Christian church.