The meaning of Tetrarch in the Bible
(From Easton's Bible Dictionary)
strictly the ruler over the fourth part of a province; but the word denotes a ruler of a province generally (Matthew 14:1; Luke 3:1,19; 9:7; Acts 13:1). Herod and Phasael, the sons of Antipater, were the first tetrarchs in Palestine. Herod the tetrarch had the title of king (Matthew 14:9).
See more on the meaning of Tetrarch in the Bible:
Tetrarch {International Standard Bible Encyclopedia}
Tetrarch {Hitchcock's Bible Name}
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