Nicaea (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.
Nicaea (Noun) — The first ecumenical council in 325 which produced the wording of the Nicene Creed and condemned the heresy of Arianism.
Nicaea (Noun) — The seventh ecumenical council in 787 which refuted iconoclasm and regulated the veneration of holy images.