The Goths, who were also stirring up Thrace and Macedonia, could no longer be driven out. The provinces subject to their pillaging soon included Pannonia farther up the Danube, where Gratian agreed with a cluster of three tribal armies to settle them as a unit under their own chiefs on vacant lands (380). By a far more significant arrangement of the same sort two years later, Theodosius assigned to the Goths a large area of Thrace along the Danube as, in effect, their own kingdom; there they enjoyed autonomy as well as a handsome subsidy from the emperor, exactly as tribes beyond the empire had done in previous treaties. They were expected to respond to calls on their manpower if the Roman army needed supplementing, as it routinely did. Although the Goths considered this treaty ended with Theodosius’ death and resumed their lawless wanderings for a while, it nevertheless represented the model for subsequent ones, again struck with the Goths under their king Alaric (from 395; see below) and with later barbarian tribes. The capture of the empire had begun. The reign of Gratian and Theodosius I
Following Valentinian’s sudden death in 375, the West was governed by his son Gratian, then 16 years old, who had been given the title of Augustus as early as 367. The Pannonian army, rife with intrigue, quickly proclaimed Gratian’s half-brother, Valentinian II, only four years old. The latter received Illyricum under his older brother’s guardianship, and this arrangement satisfied everybody. Valentinian’s advisers were executed: Maximian was sacrificed to the spite of the Senate, and Theodosius the Elder became the victim of personal jealousies. Gratian announced a liberal principate, supported in Gaul by the wealthy family of the Bordeaux poet Ausonius and in Rome by the Symmachi and the Nicomachi Flaviani, representatives of the pagan aristocracy. His generals defeated the Alemanni and the Goths on the Danube but arrived too late to save Valens.
On January 19, 379, before the army, Gratian proclaimed Theodosius, the son of the recently executed general, as Eastern emperor. Theodosius was chosen for his military ability and for his orthodoxy (Gratian, extremely pious, had come under the influence of Damasus and Ambrose). The East was enlarged by the dioceses of Dacia and Macedonia, taken from Valentinian II. Gratian and Theodosius agreed to admit the Goths into the empire, and Gratian applied the policy also to the Salian Franks in Germany. Theodosius soon dominated his weak colleague and entered the battle for the triumph of orthodoxy. In 380 the Arians were relieved of their churches in Constantinople, and in 381 the Nicaean faith was universally imposed by a council whose canons established the authority of the metropolitan bishops over their dioceses and gave the bishop of the capital a primacy similar to that of the bishop of Rome.
In ecclesiastical affairs, the separation between East and West was codified. The Westerners bowed to this policy, satisfied with the triumph of orthodoxy. Gratian then permitted Ambrose and Damasus to deal harshly with the Arians, with the support of the state. Paganism also was hounded: following Theodosius’ lead, Gratian refused the chief priesthood, removed the altar of Victory from the hall of the Roman Senate, and deprived the pagan priests and the Vestal Virgins of their subsidies and privileges. The pagan senators were outraged, but their protests were futile because Gratian was watched over by Ambrose.
This militantly orthodox policy aroused the displeasure of the pagans and of the Western Arians: thus, when Gratian left Trier for Milan, the army of Gaul and Britain proclaimed its leader, Maximus, in 383. He conquered Gaul without difficulty, and Gratian was killed in Lyons. Maximus, who, like Theodosius, was Spanish and extremely orthodox, was recognized by the latter. In the meantime, the third Augustus, Valentinian II, had taken refuge in Milan after suffering defeat in Pannonia. He was effectively under the domination of his mother, Justina, an Arian who sought support for her son among the Arians and pagans of Rome and even among the African Donatists (a Christian heresy). In 388 Maximus, after arriving in Italy, first expelled Valentinian and then prepared to attack Theodosius. The latter, accepting the inevitability of war, strengthened his resolve and gained several victories. Maximus was killed at Aquileia in 388, and thenceforth Theodosius ruled both West and East; he was represented in the East by his son Arcadius, an Augustus since 383. Valentinian II was sent to Trier, accompanied by the Frankish general Arbogast to control him.
After a few years’ respite, during the prefectureships of Nicomachus Flavianus in Rome and Tatian in the East, paganism waged its last fight: Theodosius, influenced by Ambrose, who had dared to inflict public penance on him in 390 after the massacre at Thessalonica, had determined to eliminate the pagans completely. After a few hostile clashes, the law of November 8, 392, proscribed the pagan religion. Then Arbogast, after Valentinian II’s death in 392 under shadowy circumstances, proclaimed as emperor the rhetorician Eugenius. When Theodosius refused to recognize him, Eugenius was thrown into the arms of the pagans of Rome. But this last “pagan reaction” was short-lived; in 394, with his victory at the Frigidus (modern Vipacco) River, between Aquileia and Emona, Theodosius put an end to the hopes of Eugenius and his followers. His intention was to place his son Honorius, proclaimed Augustus in 393, over the West, while returning his eldest son, Arcadius, to the East. But Theodosius’ sudden death in January 395 precipitated the division of the empire.
Theodosius had successfully dealt with the danger of the Goths, although not without taking risks, and had both established a dynasty and imposed the strictest orthodoxy. A compromise peace with the Persians had given Rome, in 387, a small section of Armenia, where he had founded Theodosiopolis (Erzurum). He had survived two pretenders in the West. These military successes were, however, won with armies in which barbarians were in the majority, which was not a good sign. The barbarian presence is reflected in the names of his commanding officers, including such Franks as Richomer, Merovech, and Arbogast, and the half-Vandal Stilicho, who through his marriage to Serena, Theodosius’ niece, had entered the imperial family. Social and economic conditions
During the 4th century the emperor’s power was theoretically absolute, the traditions of the principate having given way to the necessities of defense.
The emperor was both heir to the Hellenistic basileus (absolute king) and the anointed of the deity. Pagans and Christians alike considered him “emperor by the grace of God,” which, strictly speaking, rendered the imperial cult unnecessary. Indeed, he hardly needed the ceremonies and parade of god-awfulness with which Diocletian and his successors were surrounded. Yet imperial authority had actually lost much of its effectiveness due to the growth and nature of late Roman government. Its ranks can be estimated at more than 30,000 men—perhaps an insignificant number compared with that of modern governments but gigantic when set against the total of only a few hundred a century earlier. The problem, however, lay not in numbers but in the assumption, held throughout both bureaucracy and army, that a position of power ex officio entitled the holder to a rake-off of some sort, to be extracted both from the citizenry with whom he came in contact and from fellow members of the service in ranks below his own. This ethos was not new; but during the principate it had been restrained by higher officers and officials, who operated according to a different, essentially aristocratic, code expressed in patron-dependent relations and mutuality. Its currency was not money but favours and services. Such a code was swept away by the rapid increase in the size of government in the later 3rd century and the rise to high civil and military posts by men recruited from the ranks rather than from the upper classes. As they had bought their own promotions or appointments, so they expected to recoup their expenses (and more besides) by such means as selling exemptions and extortion. The more intrusive and demanding the military tax collection or the state’s control of the rosters of city senates, the more profit there was for a pervasively corrupt administration. Persons close to the emperor could, for a price, generally screen him from knowledge of what was going on. Constantine, for example, complained quite in vain—and the complaint was endlessly repeated by his successors—that the city senates were being “emptied of persons obligated to them by birth, who yet are asking for a government post by petition to the emperor, running off to the legions or various civil offices.” Such posts could easily be bought. A great deal of imperial planning was thus vitiated by sale. Many of the profiteers started life in the urban upper classes, but, as nouveaux riches, they joined the older landed nobility after a term in the emperor’s service.