tetrarch

/ˈtɛtrɑːrk/
noun
  1. A ruler of one part of a country or region that is divided into four parts, especially in the ancient Roman or Greek world.
    • Each tetrarch governed his own territory but answered to the Roman emperor.
    • Herod Antipas was a tetrarch who ruled over Galilee in the time of Jesus.
    • The tetrarch collected taxes from his quarter of the kingdom.
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