The massacre of the Flavian race was succeeded by a new division of the provinces; which was ratified in a personal interview of the three brothers. Constantine, the eldest of the cæsars, obtained, with a certain pre-eminence of rank, the possession of the new capital, which bore his own name and that of his father. Thrace and the countries of the East were allotted for the patrimony of Constantius; and Constans was acknowledged as the lawful sovereign of Italy, Africa, and the western Illyricum. The armies submitted to their hereditary right, and they condescended, after some delay, to accept from the Roman senate the title of Augustus. When they first assumed the reins of government, the eldest of these princes was twenty-one, the second twenty, and the third only seventeen years of age.
[338-350 A.D.]
While the martial nations of Europe followed the standards of his brothers, Constantius, at the head of the effeminate troops of Asia, was left to sustain the weight of the Persian War. At the decease of Constantine, the throne of the East was filled by Sapor, son of Hormuz or Hormisdas, and grandson of Narses, who, after the victory of Galerius, had humbly confessed the superiority of the Roman power. Although Sapor was in the thirtieth year of his long reign, he was still in the vigour of youth, as the date of his accession, by a very strange fatality, had preceded that of his birth. The wife of Hormuz remained pregnant at the time of her husband’s death; and the uncertainty of the sex, as well as of the event, excited the ambitious hopes of the princes of the house of Sassan. The apprehensions of civil war were at length removed by the positive assurance of the magi that the widow of Hormuz had conceived and would safely produce a son. Obedient to the voice of superstition, the Persians prepared, without delay, the ceremony of his coronation. A royal bed, on which the queen lay in state, was exhibited in the midst of the palace; the diadem was placed on the spot which might be supposed to conceal the future heir of Artaxerxes, and the prostrate satraps adored the majesty of their invisible and insensible sovereign.
If any credit can be given to this marvellous tale, which seems however to be countenanced by the manners of the people and by the extraordinary duration of his reign, we must admire not only the fortune but the genius of Sapor. In the soft sequestrated education of a Persian harem, the royal youth could discover the importance of exercising the vigour of his mind and body; and by his personal merit deserved a throne, on which he had been seated while he was yet unconscious of the duties and temptations of absolute power. His minority was exposed to the almost inevitable calamities of domestic discord; his capital was surprised and plundered by Thair, a powerful king of Yemen, or Arabia; and the majesty of the royal family was degraded by the captivity of a princess, the sister of the deceased king. But as soon as Sapor attained the age of manhood, the presumptuous Thair, his nation, and his country fell beneath the first effort of the young warrior, who used his victory with so judicious a mixture of rigour and clemency that he obtained from the fears and gratitude of the Arabs the title of dhoulacnaf, or protector of the nation.
The ambition of the Persian, to whom his enemies ascribe the virtues of a soldier and a statesman, was animated by the desire of revenging the disgrace of his fathers and of wresting from the hands of the Romans the five provinces beyond the Tigris. The military fame of Constantine and the real or apparent strength of his government suspended the attack; and while the hostile conduct of Sapor provoked the resentment his artful negotiations amused the patience of the imperial court. The death of Constantine was the signal of war, and the actual condition of the Syrian and Armenian frontier seemed to encourage the Persians by the prospect of a rich spoil and an easy conquest. The example of the massacres of the palace diffused a spirit of licentiousness and sedition among the troops of the East, who were no longer restrained by the habits of obedience to a veteran commander. By the prudence of Constantius, who from the interview with his brothers in Pannonia immediately hastened to the banks of the Euphrates, the legions were gradually restored to a sense of duty; but the season of anarchy had permitted Sapor to form the siege of Nisibis, and to occupy several of the most important fortresses of Mesopotamia.
During the long period of the reign of Constantius, the provinces of the East were afflicted by the calamities of the Persian War. The irregular incursions of the light troops alternately spread terror and devastation beyond the Tigris and beyond the Euphrates, from the gates of Ctesiphon to those of Antioch; and this active service was performed by the Arabs of the desert, who were divided in their interests and affections, some of their independent chiefs being enlisted in the party of Sapor, whilst others had engaged their doubtful fidelity to the emperor. The more grave and important operations of the war were conducted with equal vigour, and the armies of Rome and Persia encountered each other in nine bloody fields, in two of which Constantius himself commanded in person. The event of the day was most commonly averse to the Romans, but in the battle of Singara their imprudent valour had almost achieved a signal and decisive victory. The stationary troops of Singara retired on the approach of Sapor, who passed the Tigris over three bridges and occupied near the village of Hilleh an advantageous camp, which, by the labour of his numerous pioneers, he surrounded in one day with a deep ditch and a lofty rampart. His formidable host, when it was drawn out in order of battle, covered the banks of the river, the adjacent heights, and the whole extent of a plain of above twelve miles which separated the two armies.
Both were alike impatient for a trial of strength; but the barbarians, after a slight resistance, fled in disorder, unable to resist or desirous to weary the strength of the heavy legions, who, fainting with heat and thirst, pursued them across the plain and cut in pieces a line of cavalry clothed in complete armour which had been posted before the gates of the camp to protect their retreat (348).
Constantius, hurried along in the pursuit, attempted, without effect, to restrain the ardour of his troops by representing to them the dangers of the approaching night and the certainty of completing their success with the return of day. They, depending much more on their own valour than on the experience or the abilities of their chief, silenced by their clamours his timid remonstrances; and rushing with fury to the charge, filled up the ditch, broke down the rampart, and dispersed themselves through the tents to recruit their exhausted strength and to enjoy the rich harvest of their labours. But the prudent Sapor had watched the moment of victory. His army, of which the greater part securely posted on the heights had been spectators of the action, advanced in silence and under the shadow of the night; and his Persian archers, guided by the illumination of the camp, poured a shower of arrows on the disarmed and licentious crowd. The sincerity of history declares that the Romans were vanquished with a dreadful slaughter, and that the flying remnant of the legions was exposed to the most intolerable hardships.
Whatever advantages might attend the arms of Sapor in the field, though nine repeated victories diffused among the nations the fame of his valour and conduct, he could not hope to succeed in the execution of his designs while the fortified towns of Mesopotamia, and above all the strong and ancient city of Nisibis, remained in the possession of the Romans. This large city was situated about two days’ journey from the Tigris, in the midst of a fertile plain at the foot of Mt. Masius. In the space of twelve years, Nisibis, which since the time of Lucullus had been deservedly esteemed the bulwark of the East, sustained three memorable sieges against the power of Sapor; and the disappointed monarch, after urging his attacks above sixty, eighty, and a hundred days, was thrice repulsed with loss and ignominy.