The successor of Varahan V. was his son, Isdigerd the Second, who ascended the Persian throne without opposition in the year A.D. 440. His first act was to declare war against Rome. The Roman forces were, it would seem, concentrated in the vicinity of Nisibis; and Isdigerd may have feared that they would make an attack upon the place. He therefore anticipated them, and invaded the empire with an army composed in part of his own subjects, but in part also of troops from the surrounding nations. Saracens, Tzani, Isaurians, and Huns (Ephthalites?) served under his standard; and a sudden incursion was made into the Roman territory, for which the imperial officers were wholly unprepared. A considerable impression would probably have been produced, had not the weather proved exceedingly unpropitious. Storms of rain and hail hindered the advance of the Persian troops, and allowed the Roman generals a breathing space, during which they collected an army. But the Emperor Theodosius was anxious that the flames of war should not be relighted in this quarter; and his instructions to the prefect of the East, the Count Anatolius, were such as speedily led to the conclusion, first of a truce for a year, and then of a lasting treaty. Anatolius repaired as ambassador to the Persian camp, on foot and alone, so as to place himself completely in Isdigerd’s power--an act which so impressed the latter that (we are told) he at once agreed to make peace on the terms which Anatolius suggested. The exact nature of these terms is not recorded; but they contained at least one unusual condition. The Romans and Persians agreed that neither party should construct any new fortified post in the vicinity of the other’s territory--a loose phrase which was likely to be variously interpreted, and might easily lead to serious complications.