ETHNARCH
ethnarch
(noun) the ruler of a province (as in the Roman Empire and Byzantine Empire) or certain religious rulers with secular authority; “the election of Makarios III to archbishop gave him the status of the ethnarch of Cyprus”
Source: WordNet® 3.1
Etymology
Noun
ethnarch (plural ethnarches)
(historical, Ancient Greece) The governor of a province or people.
Source: Wiktionary
Eth"narch, n. Etym: [Gr. -arch.] (Gr. Antiq.)
Definition: The governor of a province or people. Lew Wallace.
Source: Webster’s Unabridged Dictionary 1913 Edition