cor·y·phae·us 
(kôr′ə-fēəs, kŏr′-)
(kôr′ə-fēəs, kŏr′-)n. pl. cor·y·phae·i (-fēī′)
1. The leader of a Greek chorus.
2. A leader or spokesperson.
[Latin, leader, from Greek koruphaios, from koruphē, head; see ker-1 in the Appendix of Indo-European roots.]