Above this it was the Tigris, as far probably as Feshapoor; after which it followed the line, whatever it was, which divided Oordyene from Assyria and Media.
(iii.) The extension of Armenia to the fortress of Zintha, in Media, seems to have imported much more than would at first sight appear from the words.

Gibbon interprets it as implying the cession of all Media Atropatene, which certainly appears a little later to be in the possession of the Armenian monarch, Tiridates.

A large addition to the Armenian territory out of the Median is doubtless intended; but it is quite impossible to determine definitely the extent or exact character of the cession.
(iv.) The fourth article of the treaty is sufficiently intelligible.
So long as Armenia had been a fief of the Persian empire, it naturally belonged to Persia to exercise influence over the neighboring Iberia, which corresponded closely to the modern Georgia, intervening between Armenia and the Caucasus.

Now, when Armenia had become a dependency of Rome, the protectorate hitherto exercised by the Sassanian princes passed naturally to the Caesars; and with the protectorate was bound up the right of granting investiture to the kingdom, whereby the protecting power was secured against the establishment on the throne of an unfriendly person.

Iberia was not herself a state of much strength; but her power of opening or shutting the passes of the Caucasus gave her considerable importance, since by the admission of the Tatar hordes, which were always ready to pour in from the plains of the North, she could suddenly change the whole face of affairs in North-Western Asia, and inflict a terrible revenge on any enemy that had provoked her.