Isidore of Charax (Mansion, Parthic. p. 5, 6, in Hudson, Geograph. Minor. tom. ii.) reckons 129 schoeni from Seleucia, and Thevenot (part i. l. i. ii. p. 209-245) 128 hours of march from Bagdad to Ecbatana, or Hamadan. These measures cannot exceed an ordinary parasang, or three Roman miles.