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Datis or Datus (Greek: Δάτης, Old Iranian: *Dātiya-, Achaemenid Elamite: Da-ti-ya), was a Median noble and admiral who served the Persian Empire, under Darius the Great.He was an expert in Greek affairs and maintained connections with Greek officials. He is noted for his joint leadership with the younger Artaphernes of the Persian forces in the first campaign of the Persian Wars …