Out of all the saints who lived during the epoch of Christianization of the Roman Empire from the fourth to sixth centuries, the name Constantine is one of the most well known and venerated in Russia, surpassed only by Saints Nicholas of Myra and Lycea, Basil the Great, Gregory the Theologian, and John Chrysostom.
Having cast out the unclean spirit from the demon-possessed youth, the Lord said to His disciples who had tried before Him to heal the unfortunate one but couldn’t: This kind goeth not out but by prayer and fasting (Mt. 17:21), by this setting forth fasting as a means of spiritual warfare on the same level as prayer.
The theory of "Pentarchy", deprived of both canonical and historical foundations, provided consequentially false pretexts for the defense of hegemony of Grecophone Churches over the non-Greek Orthodox Churches. The tendency expressed in this theory, as strange as it might seem, turns up from time to time in the modern era.