Thus was terminated the thirty years' war, which, commencing in A.D.502 by the attack of Kobad on Annastasius, was brought to a close in A.D.532, and ratified by Justinian in the year following.
When Chosroes consented to substitute close relations of amity with Rome for the hereditary enmity which had been the normal policy of his house, he probably expected that no very striking or remarkable results would follow.

He supposed that the barbarian neighbors of the empire on the north and on the west would give her arms sufficient employment, and that the balance of power in Eastern Europe and Western Asia would remain much as before.

But in these expectations he was disappointed.
Justinian no sooner found his eastern frontier secure than he directed the whole force of the empire upon his enemies in the regions of the west, and in the course of half a dozen years (A.D.

533-539), by the aid of his great general, Belisarius, he destroyed the kingdom of the Vandals in the region about Carthage and Tunis, subdued the Moors, and brought to its last gasp the power of the Ostrogoths in Italy.

The territorial extent of his kingdom was nearly doubled by these victories; his resources were vastly increased; the prestige of his arms was enormously raised; veteran armies had been formed which despised danger, and only desired to be led against fresh enemies; and officers had been trained capable of conducting operations of every kind, and confident, under all circumstances, of success.