Revelation 1:1 says clearly that God gave the Book of Revelation to Jesus. By ‘God’ it is clear it means the Father.
It seems the Romans thought they could establish truth by Roman might, by forcing bishops from around their Roman Empire to sit and agree what they thought is true, using Greek philosophy to express it unambiguously so it could be enforced by Roman rule. But the Christ is not mocked. The Rome-led churches who conceded to this approach were running ahead and not adhering to the teachings of the one Christ.