Properly governor of the fourth part of a larger province and kingdom, i.e. a tetrarchy. The title "king" is applied by courtesy, not right, to Herod "the tetrarch" (Luke 3:1; Mark 6:14). (See HEROD.) As Archelaus was "ethnarch" over half of Herod the Great's whole kingdom, so Philip and Antipus had divided between them the remaining half, and were each "tetrarch" over the fourth; Herod over Galilee; Philip over Ituraea and Trachonitis; Lysanias over Abilene. Caligula annexed the three tetrarchies to the kingdom of Herod Agrippa I, whom he honoured with the title "king" (Acts 12).