LOCATION DATE EMPEROR KEY PARTICIPANTS MAJOR OUTCOMES NICEA 325 Constantine Arius Alexander Eusebius of Nicomedia Eusebius of Caesarea Hosius Athanasius Declared Son homoousios (coequal, consubstantial, and coeternal) with Father. Condemned Arius. Drafted original form of Nicene Creed. CONSTANTINOPLE 381 Theodosius Meletius Gregory of Nazianzus Gregory of Nyssa Confirmed results of Council of Nicea. Produced revised Nicene Creed. Ended Trinitarian controversy.
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