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Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(ἐθνάρχης ), properly ruler of a nation; hence generally a praefect of a district or city (Lucian, Macrob. 17), e.g. Simon Maccabaeus, as head of the Jewish crommonwealth (1 Maccabees 14:47, "governor;" 15:1, 2, "prince;" Josephus, Ant. 13:6, 6); Archelaus, appointed lay his father's will and the emperor's ratification, his viceroy in Judaea (Josephus, War, 2:6, 3), of the national head (modern "patriach") of time Jews in Egypt (Josephus, Ant. 14:7, 2; conp. Strabo, 16:798). Spoken of the "governor" or mayor of the city of Damascus (2 Corinthians 11:02), under the Arabian king Aretas (q.v.). (See Walch, Disert. in Acta Aposit. 2:85.)
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McClintock, John. Strong, James. Entry for 'Ethnarch'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/e/ethnarch.html. Harper & Brothers. New York. 1870.