Coryphaeus

In Attic drama, Coryphaeus, or Koryphaios (Greek κορυφαῖος koryphaîos, from κορυφή koryphḗ́, the top of the head, and often corypheus in English) was the leader of the chorus. Hence the term (sometimes in an Anglicized form "coryphe") 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.