“The decision of Nicaea related primarily only to the esssential deity of Christ. But in the wider range of the Arian controversies the deity of the Holy Ghost, which stands and falls with the deity of the Son, was indirectly involved. The church always, indeed, connected faith in the Holy Spirit with faith in the Father and the Son, but considered the doctrine concerning the Holy Spirit as only an appendix to the doctrine concerning the Father and the Son, until the logical progress brought it to lay equal emphasis on the deity and personality of the Holy Ghost, and to place him with the Father and Son as an element of equal claim in the Trinity.

“The Arians made the Holy Ghost the first creature of the Son, and as subordinate to the Son as the Son to the Father. The Arian trinity was therefore not a trinity immanent and eternal, but arising in time and in descending grades, consisting of the uncreated God and two created demi-gods. The Semi-Arians here, as elsewhere, approached the orthodox doctrine, but rejected the consubstantiality, and asserted the creation, of the Spirit. Thus especially Macedonius, a moderate Semi-Arian, whom the Arian court-party had driven from the episcopal chair of Constantinople. From him the adherents of the false doctrine concerning the Holy Spirit, were, after 362, called Macedonians; also Pneumatomachi, and Tropici.” (Schaff, Philip; History of the Christian Church, volume 3; 1996, Hendrickson Publishers; pages 663-664.)