The Asiatic provinces of the empire had no further troubles till 502, when a war broke out between Anastasius and Kobad king of Persia. The Mesopotamian frontier had been singularly quiet for the last century; there had been no serious war with the great Oriental monarchy to the East since Julian’s unfortunate expedition in 362. The same age which had seen the Teutonic migrations in Europe had been marked in inner Asia by a great stirring of the Huns and other Turanian tribes beyond the Caspian, and while the Roman emperors had been busy on the Danube, the Sassanian kings had been hard at work defending the frontier of the Oxus. In a respite from his Eastern troubles Kobad made some demands for money on Anastasius, which the emperor refused, and war soon followed. It began with several disasters for the Romans, and Amida, the chief fortress of Mesopotamia, was stormed in 503. [Sidenote: War with Persia, 503-505.] Nisibis fell later in the same year, and when Anastasius sent reinforcements to the East he appointed so many generals with independent authority that the whole Roman army could never be united, and the commanders allowed themselves to be taken in detail and defeated in succession. In 504, however, the fortune of war turned, when the supreme authority in the field was bestowed on Celer, the _magister officiorum_; he recovered Amida after a long siege, and began to press forward beyond the Persian frontier. Kobad was at the same time assailed by the Huns from beyond the Oxus, and gladly made peace, on terms which restored the frontier of both parties to the line it had occupied in 502. Anastasius provided against future wars by building two new fortresses of the first class on the Persian frontier, Daras in Mesopotamia, and Theodosiopolis farther north on the borders of Armenia. These places served to break the force of the Persian attack thirty years later, when the successors of Kobad and Anastasius again fell to blows. The Persian war, like the Isaurian, had only afflicted a very limited district,—the province beyond the Euphrates,—and no raids had penetrated so far as Syria. Indeed, during the whole reign of Anastasius, the only serious trouble to which the Asiatic half of the empire was exposed was a Hunnish raid from beyond the Caucasus, which in 515 caused grave damage in Pontus, Cappadocia, and Lycaonia. This invasion, however, was an isolated misfortune, followed by no further incursions of the nomads of the Northern Steppes.