While Constantine ordered the council of Nicaea, he didn’t run the show. He told the self-described Christian authorities, bishops from across the empire, to settle certain differences they had once and for all. At the time, there were disputes in the church over issues as profound and obscure as the relationship between the human and the divine in Christ and as quotidian as figuring out when Easter would be. As a ruler over these Christians, Constantine had a valid interest in the end to such disputes but no interest in any given end. The arguments and conclusions reached were those of the Christian church at the time. Constantine is the one who required a settlement of these issues, but did not dictate what that settlement would be. The council of Nicaea was Christians producing answers for Christians. One might dispute those answers, but you can’t really call them Constantine’s answers.
of the 300 odd bishops who came - all agreed the Nicene creed, except one Arius an heretic unitarian.
I never said he did. I said he convened the council, which was important. A car never goes anywhere if you don’t get in & turn the key.
Other then you implying that I said he did dogma, I agree with the rest.