Noun:
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an ancient city in Bithynia; founded in the 4th century BC and flourished under the Romans; the Nicene Creed was adopted there in 325
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the seventh ecumenical council in 787 which refuted iconoclasm and regulated the veneration of holy images
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the first ecumenical council in 325 which produced the wording of the Nicene Creed and condemned the heresy of Arianism
