Not content with restoring Theodosiopolis and greatly strengthening it defences, Anastasius erected an entirely new fortress at Daras, on the southern skirts of the Mons Masius, within twelve miles of Nisibis, at the edge of the great Mesopotamian plain.

This place was not a mere fort, but a city; it contained churches, baths, porticoes, large granaries, and extensive cisterns.

It constituted a standing menace to Persia; and its erection was in direct violation of the treaty made by Theodosius with Isdigerd II., which was regarded as still in force by both nations.
We cannot be surprised that Kobad, when his Ephthalite war was over, made formal complaint at Constantinople (ab.

A.D.

517); of the infraction of the treaty.