Note 086
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.
The History Of The Decline and Fall Of The Roman Empire Chapter 24