Rome thus terminated her first period of struggle with the newly revived monarchy of Persia by a great victory and a great diplomatic success. If Narses regarded the terms--and by his conduct he would seem to have done so--as moderate under the circumstances, our conclusion must be that the disaster which he had suffered was extreme, and that he knew the strength of Persia to be, for the time, exhausted. Forced to relinquish his suzerainty over Armenia and Iberia, he saw those countries not merely wrested from himself, but placed under the protectorate, and so made to minister to the strength, of his rival. Nor was this all. Rome had gradually been advancing across Mesopotamia and working her way from the Euphrates to the Tigris. Narses had to acknowledge, in so many words, that the Tigris, and not the Euphrates, was to be regarded as her true boundary, and that nothing consequently was to be considered as Persian beyond the more eastern of the two rivers. Even this concession was not the last or the worst. Narses had finally to submit to see his empire dismembered, a portion of Media attached to Armenia, and five provinces, never hitherto in dispute, torn from Persia and added to the dominion of Rome. He had to allow Rome to establish herself in force on the left bank of the Tigris, and so to lay open to her assaults a great portion of his northern besides all his western frontier. He had to see her brought to the very edge of the Iranic plateau, and within a fortnight’s march of Persia Proper. The ambition to rival his ancestor Sapor, if really entertained, was severely punished; and the defeated prince must have felt that he had been most ill-advised in making the venture.