Meanwhile, however, he was engaged in important wars, particularly with the Roman emperors Tiberius and Maurice, who, now that the great Chosroes was dead, pressed upon Persia with augmented force, in the confident hope of recovering their lost laurels. On the first intelligence of the great king’s death, Tiberius had endeavored to negotiate a peace with his successor, and had offered to relinquish all claim on Armenia, and to exchange Arzanene with its strong fortress, Aphumon, for Daras; but Hormisdas had absolutely rejected his proposals, declared that he would surrender nothing, and declined to make peace on any other terms than the resumption by Rome of her old system of paying an annual subsidy. The war consequently continued; and Maurice, who still held the command, proceeded, in the summer of A.D. 579, to take the offensive and invade the Persian territory. He sent a force across the Tigris under Romanus, Theodoric, and Martin, which ravaged Kurdistan, and perhaps penetrated into Media, nowhere encountering any large body of the enemy, but carrying all before them and destroying the harvest at their pleasure. In the next year, A.D. 580, he formed a more ambitious project. Having gained over, as he thought, Alamundarus, the leader of the Saracens dependent on Persia, and collected a fleet to carry his stores, he marched from Gircesium down the course of the Euphrates, intending to carry the war into Southern Mesopotamia, and perhaps hoping to capture Ctesiphon. He expected to take the Persians unawares, and may not unnaturally have looked to gain an important success; but, unhappily for his plans, Alamundarus proved treacherous. The Persian king was informed of his enemy’s march, and steps were at once taken to render it abortive. Adarman was sent, at the head of a large army, into Roman Mesopotamia, where he threatened the important city of Callinicus in Maurice’s rear. That general dared advance no further. On the contrary, he felt constrained to fall back, to give up his scheme, burn his fleet, and return hastily within the Roman frontier. On his arrival, he engaged Adarman near the city which he was attacking, defeated him, and drove him back into Persia. In the ensuing spring, after another vain attempt at negotiation, the offensive was taken by the Persians, who, early in A.D. 581, crossed the frontier under Tam-chosro, and attacked the Roman city of Constantia, or Constantina. Maurice hastened to its relief; and a great battle was fought in the immediate vicinity of the city, wherein the Persians were completely defeated, and their commander lost his life. Further advantages might have been gained; but the prospect of the succession drew Maurice to Constantinople, where Tiberius, stricken with a mortal disease, received him with open arms, gave his daughter and the state into his care, and, dying soon after, left him the legacy of the empire, which he administered with success for above twenty years.