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Emperor Constantine converted to Christianity , which then became a Roman religion .The conversion was the result of either a vision or a dream in which christ direxted him to fight under christianity standards.
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In 313, Constantine and Licinius, who married Constantine's sister Constantia, agreed to end the persecution of Christians
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constatine invaded Licinius territories & foruced Licinius to Abdicate.
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He convened and presided over the first "ecumenical" council at Nicea in 325 to respond to the teachings of Arius
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Constantine was baptized by Eusebius of Nicomedia in 337, just before he died
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Constantine, the Roman ruler who converted to Christianity, commissions Bibles to be produced by hand, but these Bibles include writings (such as the Shepherd of Hermas and Didache) not accepted in later canons of the New Testament.
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Nicene Creed.” It formulated at the council of Nicea 345 C.E. starting out this way:
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After removing a Roman temple Constantine had the Church of the Holy Sepulcher constructed in Jerusalem. Built around the excavated hill of the Crucifixion, legend has it that Constantine's mother Helena discovered the True Cross here.
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Saint Athanasius is the first to list all 27 New Testament books in his festal letter.
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Ecumenical council held at Ephesus refutes Nestorianism.
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Ecumenical council at Chalcedon affirms Christ as having two distinct natures united in one person
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Columba establishes a monastery at Iona.
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Synod of Whitby ratifies the authority of the Pope in England.
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Bede writes his Ecclesiastical History.
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Great Schism - Eastern Orthodox and Western Catholic churches separate.
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Ecumenical Council at Constantinople revises the Nicene creed to its current form.
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Saint Jerome begins a translation of the Bible into Latin.
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Synod at Carthage ratifies the 27 books of the New Testament as sacred scripture.
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At Ephesus, Pope Leo I delivers his 'Tome', defending orthodox Christian belief. Leo also asserts Papal supremacy.
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Insertion of the filioque into the Nicene-Constantinopolitan Creed at a council in Toledo.
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Following a mission authorised by Pope Gregory I, St. Augustine becomes the first Archbishop of Canterbury.
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Ecumenical council at Constantinople rejects Monothelite heresy of one will in Christ.
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Charlemagne is crowned emperor of the Holy Roman Empire by Pope Leo III.
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Conversion of Prince Vladimir in Kiev. Growth of Christianity in Russia.
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Ecumenical council at Nicea ends the controversy over the use of icons in worship.