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Constantine is born Flavius Valerius Constantinus in the city of Naissus in Moesia
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The empire is ruled by two co-emperors, called Augustus, and each has two junior rulers under them, called Caesar.
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Constantine returns from a war to witness Diocletian carrying out the "Great Persecution." Diocletian persecutes all Christians
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Galerius is named Augustus in the east, and Constantine's father, Constantius, is named Augustus in the west. Constantine is forced to flee to his father's protection to avoid Galerius's attempts to kill him
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He names Constantine his heir as Augustus.
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Constantine had a dream: if he went to war against Maxentius under the Christian Cross he would win.... And he did!
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Both men agree to the Edict of Milan, which stops the prosecution of Christianity and all other religions in the Empire.
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Peace is short-lived as Licinius starts procecting Christians again, and it dissolves into war. Constantine defeats Licinius in the Civil War and this makes him the sole emperor of Rome.
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Constantine is finally baptized as a Christian shortly before dying.