eparch

from WordNet (r) 3.0 (2006)

eparch
    n 1: a bishop or metropolitan in charge of an eparchy in the
         Eastern Church
    2: the governor or prefect of an eparchy in ancient Greece

from The Collaborative International Dictionary of English v.0.48

Eparch \Ep"arch\, n. [Gr. ?; 'epi` over + ? chief, ? supreme
   power, dominion.]
   In ancient Greece, the governor or perfect of a province; in
   modern Greece, the ruler of an eparchy.
   [1913 Webster]