exarch

n. [ L. exarchus, Gr. &unr_; &unr_; commander; &unr_;, &unr_;, out + &unr_; to lead, rule: cf. F. exarque. ] A viceroy; in Ravenna, the title of the viceroys of the Byzantine emperors; in the Eastern Church, the superior over several monasteries; in the modern Greek Church, a deputy of the patriarch , who visits the clergy, investigates ecclesiastical cases, etc. [ 1913 Webster ]