The Original Doctrines of the Christian Faith up to the Quartodeciman Schism of 154-192 CE – No. 88

No .88 - The Original Doctrines of the Christian Faith up to the Quartodeciman Schism of 154-192 CE
The Trinity did not come into existence until it was defined at the Council of Constantinople in 381. At Nicea in 325 the Trinity was not formulated. Only the foundation of the Binitarian structure was laid down here. All the Catholic Church was Unitarian until the Modal structure entered Rome from the worship of Attis in the beginning of the third century.
http://www.ccg.org/weblibs/study-papers/p088.html