Basil of Ancyra, Eustathius of Sebaste, and their party declared that the Son was of similar substance to the Father, as in the majority decision at Seleucia, a position known as homoiousia.
Maris of Chalcedon, Eudoxius of Antioch, and the deacons Aëtius and Eunomius declared that the Son was of a dissimilar substance from the Father, a position known as anomoeanism or heteroousia.
[2][3] The Heteroousians defeated the Homoiousians in an initial debate, but Constantius banished Aëtius,[4] after which the council, including Maris and Eudoxius,[5] agreed to the homoian creed of Ariminum with minor modifications.
[We believe] also in the Holy Spirit, whom he himself the only-begotten of God, Christ our Lord and God, promised to send to mankind as the Comforter, according as it is written, "the Spirit of truth;" whom he sent to them after he was received into the heavens.But since the term ousia [substance or essence], which was used by the fathers in a very simple and intelligible sense, but not being understood by the people, has been a cause of offense, we have thought proper to reject it, as it is not contained even in the sacred writings; and that no mention of it should be made in future, inasmuch as the holy Scriptures have nowhere mentioned the substance of the Father and of the Son.
Πᾶσαι δὲ αἱρέσεις, αἵ τε ἤδη πρότερον κατεκρίθησαν, καὶ αἵ τινες ἐὰν καινότεραι γένωνται, ἐναντίαι τυγχάνουσαι τῆς ἐκτεθείσης ταύτης γραφῆς, ἀνάθεμα ἔστωσαν.Heortasius of Sardis, Dracontius of Pergamum, Silvanus of Tarsus, Sophronius of Pompeiopolis, Elpidius of Satala, Neonas of Seleucia, and Saint Cyril of Jerusalem were all exiled for their part in the Council of Seleucia[14] the year before.