a trusted friend and correspondent of Gregory Nazianzen, who addressed to him his two celebrated letters against Apollinaris. The second of these was a reply to one of Cledonius, asking him to declare his belief as to the person of Christ. In it Gregory begs Cledonius to assure all that he held the Nicene creed inviolate. These letters were adopted as documents of faith by the councils of Ephesus and Chalcedon Gregory Nazianzen, Orat. 51,