As soon as Diocletian had indulged his private resentment, and asserted the majesty of supreme power, he yielded to the submissive entreaties of the Caesar, and permitted him to retrieve his own honor, as well as that of the Roman arms. In the room of the unwarlike troops of Asia, which had most probably served in the first expedition, a second army was drawn from the veterans and new levies of the Illyrian frontier, and a considerable body of Gothic auxiliaries were taken into the Imperial pay. 69 At the head of a chosen army of twenty-five thousand men, Galerius again passed the Euphrates; but, instead of exposing his legions in the open plains of Mesopotamia he advanced through the mountains of Armenia, where he found the inhabitants devoted to his cause, and the country as favorable to the operations of infantry as it was inconvenient for the motions of cavalry. 70 Adversity had confirmed the Roman discipline, while the barbarians, elated by success, were become so negligent and remiss, that in the moment when they least expected it, they were surprised by the active conduct of Galerius, who, attended only by two horsemen, had with his own eyes secretly examined the state and position of their camp. A surprise, especially in the night time, was for the most part fatal to a Persian army. “Their horses were tied, and generally shackled, to prevent their running away; and if an alarm happened, a Persian had his housing to fix, his horse to bridle, and his corselet to put on, before he could mount.” 71 On this occasion, the impetuous attack of Galerius spread disorder and dismay over the camp of the barbarians. A slight resistance was followed by a dreadful carnage, and, in the general confusion, the wounded monarch (for Narses commanded his armies in person) fled towards the deserts of Media. His sumptuous tents, and those of his satraps, afforded an immense booty to the conqueror; and an incident is mentioned, which proves the rustic but martial ignorance of the legions in the elegant superfluities of life. A bag of shining leather, filled with pearls, fell into the hands of a private soldier; he carefully preserved the bag, but he threw away its contents, judging that whatever was of no use could not possibly be of any value. 72 The principal loss of Narses was of a much more affecting nature. Several of his wives, his sisters, and children, who had attended the army, were made captives in the defeat. But though the character of Galerius had in general very little affinity with that of Alexander, he imitated, after his victory, the amiable behavior of the Macedonian towards the family of Darius. The wives and children of Narses were protected from violence and rapine, conveyed to a place of safety, and treated with every mark of respect and tenderness, that was due from a generous enemy to their age, their sex, and their royal dignity. 73
While the East anxiously expected the decision of this great contest, the emperor Diocletian, having assembled in Syria a strong army of observation, displayed from a distance the resources of the Roman power, and reserved himself for any future emergency of the war. On the intelligence of the victory he condescended to advance towards the frontier, with a view of moderating, by his presence and counsels, the pride of Galerius. The interview of the Roman princes at Nisibis was accompanied with every expression of respect on one side, and of esteem on the other. It was in that city that they soon afterwards gave audience to the ambassador of the Great King. 74 The power, or at least the spirit, of Narses, had been broken by his last defeat; and he considered an immediate peace as the only means that could stop the progress of the Roman arms. He despatched Apharban, a servant who possessed his favor and confidence, with a commission to negotiate a treaty, or rather to receive whatever conditions the conqueror should impose. Apharban opened the conference by expressing his master’s gratitude for the generous treatment of his family, and by soliciting the liberty of those illustrious captives. He celebrated the valor of Galerius, without degrading the reputation of Narses, and thought it no dishonor to confess the superiority of the victorious Caesar, over a monarch who had surpassed in glory all the princes of his race. Notwithstanding the justice of the Persian cause, he was empowered to submit the present differences to the decision of the emperors themselves; convinced as he was, that, in the midst of prosperity, they would not be unmindful of the vicissitudes of fortune. Apharban concluded his discourse in the style of eastern allegory, by observing that the Roman and Persian monarchies were the two eyes of the world, which would remain imperfect and mutilated if either of them should be put out.
“It well becomes the Persians,” replied Galerius, with a transport of fury, which seemed to convulse his whole frame, “it well becomes the Persians to expatiate on the vicissitudes of fortune, and calmly to read us lectures on the virtues of moderation. Let them remember their own moderation, towards the unhappy Valerian. They vanquished him by fraud, they treated him with indignity. They detained him till the last moment of his life in shameful captivity, and after his death they exposed his body to perpetual ignominy.” Softening, however, his tone, Galerius insinuated to the ambassador, that it had never been the practice of the Romans to trample on a prostrate enemy; and that, on this occasion, they should consult their own dignity rather than the Persian merit. He dismissed Apharban with a hope that Narses would soon be informed on what conditions he might obtain, from the clemency of the emperors, a lasting peace, and the restoration of his wives and children. In this conference we may discover the fierce passions of Galerius, as well as his deference to the superior wisdom and authority of Diocletian. The ambition of the former grasped at the conquest of the East, and had proposed to reduce Persia into the state of a province. The prudence of the latter, who adhered to the moderate policy of Augustus and the Antonines, embraced the favorable opportunity of terminating a successful war by an honorable and advantageous peace. 75
In pursuance of their promise, the emperors soon afterwards appointed Sicorius Probus, one of their secretaries, to acquaint the Persian court with their final resolution. As the minister of peace, he was received with every mark of politeness and friendship; but, under the pretence of allowing him the necessary repose after so long a journey, the audience of Probus was deferred from day to day; and he attended the slow motions of the king, till at length he was admitted to his presence, near the River Asprudus in Media. The secret motive of Narses, in this delay, had been to collect such a military force as might enable him, though sincerely desirous of peace, to negotiate with the greater weight and dignity. Three persons only assisted at this important conference, the minister Apharban, the praefect of the guards, and an officer who had commanded on the Armenian frontier. 76 The first condition proposed by the ambassador is not at present of a very intelligible nature; that the city of Nisibis might be established for the place of mutual exchange, or, as we should formerly have termed it, for the staple of trade, between the two empires. There is no difficulty in conceiving the intention of the Roman princes to improve their revenue by some restraints upon commerce; but as Nisibis was situated within their own dominions, and as they were masters both of the imports and exports, it should seem that such restraints were the objects of an internal law, rather than of a foreign treaty. To render them more effectual, some stipulations were probably required on the side of the king of Persia, which appeared so very repugnant either to his interest or to his dignity, that Narses could not be persuaded to subscribe them. As this was the only article to which he refused his consent, it was no longer insisted on; and the emperors either suffered the trade to flow in its natural channels, or contented themselves with such restrictions, as it depended on their own authority to establish.
As soon as this difficulty was removed, a solemn peace was concluded and ratified between the two nations. The conditions of a treaty so glorious to the empire, and so necessary to Persia Persian, may deserve a more peculiar attention, as the history of Rome presents very few transactions of a similar nature;