The first attempts of Galerius were unfortunate. Summoned suddenly from the Danube to the Euphrates, and placed at the head of an army composed chiefly of the levies of Asia, ill-disciplined, and unacquainted with their commander, he had to meet an adversary of whom he knew little or nothing, in a region the character of which was adverse to his own troops and favorable to those of the enemy. Narses had invaded the Roman province of Mesopotamia, had penetrated to the Khabour, and was threatening to cross the Euphrates into Syria. Galerius had no choice but to encounter him on the ground which he had chosen. Now, though Western Mesopotamia is ill-described as a smooth and barren surface of sandy desert, without a hillock, without a tree, and without a spring of fresh water, it is undoubtedly an open country, possessing numerous plains, where, in a battle, the advantage of numbers is likely to be felt, and where there is abundant room for the evolutions of cavalry. The Persians, like their predecessors the Parthians, were especially strong in horse; and the host which Narses had brought into the field greatly outnumbered the troops which Diocletian had placed at the disposal of Galerius. Yet Galerius took the offensive. Fighting under the eye of a somewhat stern master, he was scarcely free to choose his plan of campaign. Diocletian expected him to drive the Persians from Mesopotamia, and he was therefore bound to make the attempt. He accordingly sought out his adversary in this region, and engaged him in three great battles. The first and second appear to have been indecisive; but in the third the Roman general suffered a complete defeat. The catastrophe of Crassus was repeated almost upon the same battle-field, and probably almost by the same means. But, personally, Galerius was more fortunate than his predecessor. He escaped from the carnage, and, recrossing the Euphrates, rejoined his father-in-law in Syria. A conjecture, not altogether destitute of probability, makes Tiridates share both the calamity and the good fortune of the Roman Caesar. Like Galerius, he escaped from the battle-field, and reached the banks of the Euphrates. But his horse, which had received a wound, could not be trusted to pass the river. In this emergency the Armenian prince dismounted, and, armed as he was, plunged into the stream. The river was both wide and deep; the current was rapid; but the hardy adventurer, inured to danger and accustomed to every athletic exercise, swam across and reached the opposite bank in safety.
Thus, while the rank and file perished ignominiously, the two personages of most importance on the Roman side were saved. Galerius hastened towards Antioch, to rejoin his colleague and sovereign. The latter came out to meet him, but, instead of congratulating him on his escape, assumed the air of an offended master, and, declining to speak to him or to stop his chariot, forced the Caesar to follow him on foot for nearly a mile before he would condescend to receive his explanations and apologies for defeat. The disgrace was keenly felt, and was ultimately revenged upon the prince who had contrived it. But, at the time, its main effect doubtless was to awake in the young Caesar the strongest desire of retrieving his honor, and wiping out the memory of his great reverse by a yet more signal victory. Galerius did not cease through the winter of A.D. 297 to importune his father-in-law for an opportunity of redeeming the past and recovering his lost laurels.
The emperor, having sufficiently indulged his resentment, acceded to the wishes of his favorite. Galerius was continued in his command. A new army was collected during the winter, to replace that which had been lost; and the greatest care was taken that its material should be of good quality, and that it should be employed where it had the best chance of success. The veterans of Illyria and Moesia constituted the flower of the force now enrolled; and it was further strengthened by the addition of a body of Gothic auxiliaries. It was determined, moreover, that the attack should this time be made on the side of Armenia, where it was felt that the Romans would have the double advantage of a friendly country, and of one far more favorable for the movements of infantry than for those of an army whose strength lay in its horse. The number of the troops employed was still small. Galerius entered Armenia at the head of only 25,000 men; but they were a picked force, and they might be augmented, almost to any extent, by the national militia of the Armenians. He was now, moreover, as cautious as he had previously been rash; he advanced slowly, feeling his way; he even personally made reconnaissances, accompanied by only one or two horsemen, and, under the shelter of a flag of truce, explored the position of his adversary. Narses found himself overmatched alike in art and in force. He allowed himself to be surprised in his camp by his active enemy, and suffered a defeat by which he more than lost all the fruits of his former victory. Most of his army was destroyed; he himself received a wound, and with difficulty escaped by a hasty flight. Galerius pursued, and, though he did not succeed in taking the monarch himself, made prize of his wives, his sisters, and a number of his children, besides capturing his military chest. He also took many of the most illustrious Persians prisoners. How far he followed his flying adversary is uncertain; but it is scarcely probable that he proceeded much southward of the Armenian frontier. He had to reinstate Tiridates in his dominions, to recover Eastern Mesopotamia, and to lay his laurels at the feet of his colleague and master. It seems probable that having driven Narses from Armenia, and left Tiridates there to administer the government, he hastened to rejoin Diocletian before attempting any further conquests.
The Persian monarch, on his side, having recovered from his wound, which could have been but slight, set himself to collect another army, but at the same time sent an ambassador to to the camp of Galerius, requesting to know the terms on which Rome would consent to make peace. A writer of good authority has left us an account of the interview which followed between the envoy of the Persian monarch and the victorious Roman. Apharban (so was the envoy named) opened the negotiations with the following speech:
“The whole human race knows,” he said, “that the Roman and Persian kingdoms resemble two great luminaries, and that, like a man’s two eyes, they ought mutually to adorn and illustrate each other, and not in the extremity of their wrath to seek rather each other’s destruction. So to act is not to act manfully, but is indicative rather of levity and weakness; for it is to suppose that our inferiors can never be of any service to us, and that therefore we had bettor get rid of them. Narses, moreover, ought not to be accounted a weaker prince than other Persian kings; thou hast indeed conquered him, but then thou surpassest all other monarchs; and thus Narses has of course been worsted by thee, though he is no whit inferior in merit to the best of his ancestors. The orders which my master has given me are to entrust all the rights of Persia to the clemency of Rome; and I therefore do not even bring with me any conditions of peace, since it is for the emperor to determine everything. I have only to pray, on my master’s behalf, for the restoration of his wives and male children; if he receives them at your hands, he will be forever beholden to you, and will be better pleased than if he recovered them by force of arms. Even now my master cannot sufficiently thank you for the kind treatment which he hears you have vouchsafed them, in that you have offered them no insult, but have behaved towards them as though on the point of giving them back to their kith and kin. He sees herein that you bear in mind the changes of fortune and the instability of all human affairs.”
At this point Galerius, who had listened with impatience to the long harangue, burst in with a movement of anger that shook his whole frame—“What? Do the Persians dare to remind us of the vicissitudes of fortune, as though we could forget how they behave when victory inclines to them? Is it not their wont to push their advantage to the uttermost and press as heavily as may be on the unfortunate? How charmingly they showed the moderation that becomes a victor in Valerian’s time! They vanquished him by fraud; they kept him a prisoner to advanced old age; they let him die in dishonor; and then when he was dead they stripped off his skin, and with diabolical ingenuity made of a perishable human body an imperishable monument of our shame. Verily, if we follow this envoy’s advice, and look to the changes of human affairs, we shall not be moved to clemency, but to anger, when we consider the past conduct of the Persians. If pity be shown them, if their requests be granted, it will not be for what they have urged, but because it is a principle of action with us—a principle handed down to us from our ancestors—to spare the humble and chastise the proud.” Apharban, therefore, was dismissed with no definite answer to his question, what terms of peace Rome would require; but he was told to assure his master that Rome’s clemency equalled her valor, and that it would not be long before he would receive a Roman envoy authorized to signify the Imperial pleasure, and to conclude a treaty with him.
Having held this interview with Apharban, Galerius hastened to meet and consult his colleague. Diocletian had remained in Syria, at the head of an army of observation, while Galerius penetrated into Armenia and engaged the forces of Persia. When he heard of his son-in-law’s great victory he crossed the Euphrates, and advancing through Western Mesopotamia, from which the Persians probably retired, took up his residence at Nisibis, now the chief town of these parts. It is perhaps true that his object was “to moderate, by his presence and counsels, the pride of Galarius.” That prince was bold to rashness, and nourished an excessive ambition. He is said to have at this time entertained a design of grasping at the conquest of the East, and to have even proposed to himself to reduce the Persian Empire into the form of a Roman province. But the views of Diocletian were humbler and more prudent. He held to the opinion of Augustus and Hadrian, that Rome did not need any enlargement of her territory, and that the absorption of the East was especially undesirable. When he and his son-in-law met and interchanged ideas at Nisibis, the views of the elder ruler naturally prevailed; and it was resolved to offer to the Persians tolerable terms of peace. A civilian of importance, Sicorius Probus, was selected for the delicate office of envoy, and was sent, with a train of attendants, into Media, where Narses had fixed his headquarters. We are told that the Persian monarch received him with all honor, but, under pretence of allowing him to rest and refresh himself after his long journey, deferred his audience from day to day; while he employed the time thus gained in collecting from various quarters such a number of detachments and garrisons as might constitute a respectable army. He had no intention of renewing the war, but he knew the weight which military preparation ever lends to the representations of diplomacy. Accordingly it was not until he had brought under the notice of Sicorius a force of no inconsiderable size that he at last admitted him to an interview. The Roman ambassador was introduced into an inner chamber of the royal palace in Media, where he found only the king and three others—Apharban, the envoy sent to Galerius, Archapetes, the captain of the guard, and Barsaborsus, the governor of a province on the Armenian frontier. He was asked to unfold the particulars of his message, and say what were the terms on which Rome would make peace. Sicorius complied. The emperors, he said, required five things:—(i.) The cession to Rome of five provinces beyond the river Tigris, which are given by one writer as Intilene, Sophene, Arzanene, Carduene, and Zabdicene; by another as Arzanene, Moxoene, Zabdicene, Rehimene, and Corduene; (ii.) the recognition of the Tigris, as the general boundary between the two empires; (iii.) the extension of Armenia to the fortress of Zintha, in Media; (iv.) the relinquishment by Persia to Rome of her protectorate over Iberia, including the right of giving investiture to the Iberian kings; and (v.) the recognition of Nisibis as the place at which alone commercial dealings could take place between the two nations.
It would seem that the Persians were surprised at the moderation of these demands. Their exact value and force will require some discussion; but at any rate it is clear that, under the circumstances, they were not felt to be excessive. Narses did not dispute any of them except the last: and it seems to have been rather because he did not wish it to be said that he had yielded everything, than because the condition was really very onerous, that he made objection in this instance. Sicorius was fortunately at liberty to yield the point. He at once withdrew the fifth article of the treaty, and, the other four being accepted, a formal peace was concluded between the two nations.
To understand the real character of the peace now made, and to appreciate properly the relations thereby established between Rome and Persia, it will be necessary to examine at some length the several conditions of the treaty, and to see exactly what was imported by each of them. There is scarcely one out of the whole number that carries its meaning plainly upon its face; and on the more important very various interpretations have been put, so that a discussion and settlement of some rather intricate points is here necessary.
(i.) There is a considerable difference of opinion as to the five provinces ceded to Rome by the first article of the treaty, as to their position and extent, and consequently as to their importance. By some they are put on the right, by others on the left, bank of the Tigris; while of those who assign them this latter position some place them in a cluster about the sources of the river, while others extend them very much further to the southward. Of the five provinces three only can be certainly named, since the authorities differ as to the two others. These three are Arzanene, Cordyene, and Zabdicene, which occur in that order in Patricius. If we can determine the position of these three, that of the others will follow, at least within certain limits.