the leading Byzantine government official from the 6th to the 11th century, entrusted with the authority to maintain public order and safety in ... Found on http://www.britannica.com/eb/a-z/e/35
Ep'arch noun [ Greek ...; 'epi` over + ... chief, ... supreme power, dominion.] In ancient Greece, the governor or perfect of a province; in modern Greece, the ruler of an eparchy. Found on http://www.encyclo.co.uk/webster/E/52