Definition of "Nicaea" :

noun: the first ecumenical council in 325 which produced the wording of the Nicene Creed and condemned the heresy of Arianism

noun: the seventh ecumenical council in 787 which refuted iconoclasm and regulated the veneration of holy images

noun: an ancient city in Bithynia; founded in the 4th century BC and flourished under the Romans; the Nicene Creed was adopted there in 325