15 If anything has to be discussed I have learned to discuss it in church as those before me did. If a conference is to be held concerning the faith, there ought to be a gathering of Bishops, as was done under Constantine, the Prince of august memory, who did not promulgate any laws beforehand, but left the decision to the Bishops. This was done also under Constantius, Emperor of august memory, the heir of his father's dignity. But what began well ended otherwise, for the Bishops had at first subscribed an unadulterated confession of faith, but since some were desirous of deciding concerning the faith inside the palace, they managed that those decisions of the Bishops should be altered by fraud. But they immediately recalled this perverted decision, and certainly the larger number at Ariminum approved the faith of the Nicene Council and condemned the Arian propositions.
Source: Letters (New Advent)