Adiabene was probably a small province lying between the Tigris, Lycus, and the Gordiæan Mountains (see Dion Cassius, LXVIII.), but before the time of Pliny, according to Vaux (in Smith’s Dict. of Greek and Roman Geography), the word was used in a wider sense to indicate Assyria in general (see Pliny, H. N. VI. 12, and Ammianus Marcellinus, XXIII. 6). Izates was king of Adiabene in the narrower sense.