Hystaspes hĭstăs´pēz [key] or Hystaspis hĭstăs´pĭs [key], Old Persian Vishtaspa, fl. 6th cent. BC, ruler of ancient Persia, father of Darius I . Under him Darius was governor of Parthia. The legendary patron of Zoroaster is also called Hystaspes or Vishtaspa; he may or may not be the same as Darius' father.

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