What are the Doctrine of Arianism and why was it declared as heresy by early Christian fathers?
A Council of East and West in 359 declared Christ to be simply ‘like’ the Father, a major victory for the Arians. Then, in 381, the Council of Constantinople asserted the deity of the Holy Spirit and acknowledged the position taken at Nicaea that the Father and Son were of identical substance. This was the end of Arianism in the Roman Empire, although it continued to flourish among the Goths, who had been converted by Arian missionaries.
