The Primacy of Peter Supported by the Early Eastern Fathers and Bishops

Constantinople

St. Proclus, Patriarch of Constantinople (434): 
A disciple of St. John Chrysostom

Peter, the coryphaeus of the disciples, and the one set over (or chief of) the Apostles. Art not thou he that didst say, 'Thou art the Christ, the Son of the living God'? Thou Bar-Jonas (son of the dove) hast thou seen so many miracles, and art thou still but Simon (a hearer)? He appointed thee the key-bearer of Heaven, and has though not yet layed aside thy fisherman's clothing? (Proclus, Or. viii In Dom. Transfig. t. ix. Galland)

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In Attic drama, the coryphaeus, corypheus, or koryphaios (Greek κορυφαῖος koryphaîos, from κορυφή koryphḗ́, the top of the head) was the leader of the chorus. Hence the term is used for the chief or leader of any company or movement. The coryphaeus spoke for all the rest, whenever the chorus took part in the action, in quality of a person of the drama, during the course of the acts.

The term is sometimes used for the chief or principal of any company, corporation, sect, opinion, etc. Thus, Eustathius of Antioch is called the coryphaeus of the First Council of Nicaea, and Cicero calls Zeno the coryphaeus of the Stoics.