Ethnarch

Ethnarch (pronounced , also ethnarches, Greek: ἐθνάρχης) is political leadership over a common ethnic group or homogeneous kingdom.

The word is derived from the Greek words ἔθνος (ethnos, "tribe/nation") and ἄρχων (archon, "leader/ruler"). Strong's Concordance gives the definition of 'ethnarch' as "the governor (not king) of a district".