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325 CERoman Emperor Constantine I calls the Council of Nicaea.
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381 CEThe First Council of Constantinople adds to Nicene Creed.
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431 CEFirst Council of Ephesus.
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439 CESecond Council of Ephesus.
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8 Oct 451 CE - 1 Nov 451 CEFourth Ecumenical Council takes place in Chalcedon, determining that Jesus Christ had two distinct natures and wills, perfectly united.