For other uses of the word Dati, see Dati (disambiguation).Datis or Datus (Old Persian: Dâtiça), was a Median admiral who served the Persian Empire, under Darius the Great. He is most notable for his joint leadership with Artaphernes of the Persian forces in the first campaign of the Persian Wars against the Greeks.Datis was one of the Persian commanders responsible for the siege of Naxos and the sacking of Eretria in 490 BC along with the infamous Persian Immortals.