exarch

Etymology
Borrowed from.

Noun

 * 1)  In the Byzantine Empire, a governor of a distant province.
 * 2) In the Eastern Christian Churches, the deputy of a patriarch, or a bishop who holds authority over other bishops without being a patriarch.
 * 3) In these same churches, a bishop appointed over a group of the faithful not yet large enough or organized enough to constitute an eparchy or diocese.

Translations

 * French:
 * Italian: