St. Flavian, Patriarch of Constantinople, a great Confessor and a champion against the Eutychian heresy of the Monophysites, writes to St. Leo, Pope of Rome: “...As we witnessed the way that the Orthodox faith was violated and the heresies of Apollinaris and Valentinus were revived by Eutyches, it became necessary to declare this in order to preserve the people.” [¹⁵]