Desperate situations have a way of thrusting greatness upon seemingly ordinary people, and in its hour of need, a retired general arrived to save the empire. His name was Theodosius, and though he was only in his early thirties, he already possessed a formidable military education. Born in Spain to an army family, as a youth he had cut his teeth putting down rebellions in Britain and campaigning on the lower Danube. By the time of the disaster of Adrianople, the empire could boast no finer general, and the western emperor, Gratian, raised him to the rank of emperor, charging him with restoring order to the eastern half of the empire.
The task was nearly impossible, and there was no shortage of people telling him so, but Theodosius threw himself into the job with a refreshing sense of energy and purpose. To replace the nearly twenty thousand veterans who had been lost, he started a massive recruitment drive, pressing every able-bodied man into service—even those who had mutilated themselves in hopes of escaping. When this still failed to produce enough men, the emperor resorted to the dangerous precedent of enlisting Gothic renegades, swelling his ranks with barbarian troops. The gamble worked, and in 382, after a long and bitter struggle, Theodosius forced the Goths to sign a peace treaty with the Roman Empire. Confirming the previous arrangement, Theodosius allowed the Goths to settle on Roman land in exchange for contributing twenty thousand men to the imperial army. This continued the dubious precedent of letting a sovereign nation settle inside the empire’s frontiers, but Theodosius could congratulate himself on having staved off the collapse of the East, as well as having solved his manpower needs all in one blow. A few voices were predictably raised, objecting to the “barbarization” of the military, wondering aloud if absorbing such a strong Germanic element into the army didn’t create more of a threat than it replaced, but they were easily ignored in the face of political realities. After all, immigration had always been a source of strength to the empire, and some of its greatest emperors had been from territories as diverse as Africa and Britain. Even Theodosius’s native Spain had once been called barbaric, and it was now just as Roman as Augustan Italy.
Such were the things that men said to comfort themselves, but these barbarians had no reason to become Roman and never would. The Goths who joined the imperial army served under their own commanders, spoke their own language, and maintained their own customs. They had no reason to blend in and so failed to become Romanized, remaining a semiautonomous group within the borders of the empire. Within a generation, they would completely dominate the government and push Europe toward the terrible chaos of the Dark Ages. Though he had no way of knowing it at the time, Theodosius had signed the death warrant of the Roman West.
Barbarian pressure wasn’t the only thing transforming the classical empire into medieval Europe. In addition to the Gothic treaty, the year 382 saw the beginning of the final triumph of Christianity within the empire. It started, remarkably enough, with a terrible sickness. Traveling to Thessalonica, Theodosius fell so seriously ill that his ministers despaired of his life. Like all the Christian emperors, he had delayed his baptism, hoping to wipe away his sins at the last moment and enter the judgment hall with a clean slate. The local bishop was summoned, and in a hasty ceremony he baptized the dying emperor. To the great astonishment of his attendants, the emperor made a full recovery, and by the time he reached Constantinople, he was a profoundly changed man. As an unbaptized Christian, Theodosius could afford to ignore his conscience, since he could count on his eventual baptism to wash away whatever foul deeds he had committed. Now that he was a full communicant member of the church, however, he had placed himself beneath the spiritual authority of the bishops. No longer could he cavalierly order the execution of innocents or ignore the heresy that was ripping the church apart. It was his sacred duty to restore both temporal and spiritual peace. To ignore either one would put his soul at risk.
Nearly every emperor after Constantine—even Julian, in his own way—had been a supporter of the Arian heresy, and this imperial patronage had kept the rift in Christianity alive and well. Determined to put an end to it once and for all, Theodosius summoned a great council of the church to meet at Constantinople and offer an explicit condemnation of Arianism. After some deliberation, the bishops did so, giving a ringing endorsement of the Nicene Creed, and giving Theodosius official sanction to move against the heresy. The emperor acted with all the firmness that Constantine had never shown. Arians were compelled to surrender their churches, and without imperial support their congregations quickly disappeared. Within the empire, only the Goths remained stubbornly Arian, but although they soon came to dominate the West, they never made a serious attempt to convert their Christian subjects. After a disastrous sixty years of infighting, the Arian controversy was at last over.
Having put the church in order, Theodosius was soon convinced to move against the dying embers of paganism. Though it had deep roots throughout the empire, for most citizens, paganism had long since been reduced to a collection of venerable traditions without any significant religious meaning. But since the temples were public property, they continued to be maintained at the public’s expense, and the awkward fact of Christian emperors funding pagan rituals horrified the emperor’s fiery religious adviser, Bishop Ambrose of Milan.
This wasn’t the first time the bishop had attempted to enlist imperial support in stamping out the last traces of the ancient religion. A few years before, the bishop had convinced the emperor Gratian that it was embarrassing for a Christian emperor to be carrying around the title Pontifex Maximus—chief priest of the state religion—prompting Gratian to go striding into the Senate House of Rome and publicly declare that he was renouncing the title.* Unfortunately for Ambrose, Gratian was killed soon after, and the provoked senators tried to revive their religion by putting a pagan on the throne. Theodosius quickly overthrew the man, uniting the empire under his leadership, but the episode convinced the bishop that paganism was a dangerous force that had to be actively destroyed. For the moment, the rather mild Theodosius ignored his thundering sermons, but a clash between the two was inevitable.
It was set off when one of Theodosius’s generals was lynched during an uprising in Thessalonica, and to punish the city, the furious emperor trapped seven thousand citizens in its hippodrome and slaughtered them. When he heard the news, Ambrose was mortified and marched into the palace to tell Theodosius that no matter what the provocation, a Christian emperor didn’t go about killing innocent civilians. When Theodosius ignored him, feeling fully justified in enforcing his authority, Ambrose turned up the pressure by denying him communion or entrance to a church until he performed penance. After several months of endangering his soul without the sacrament, Theodosius caved in. Dressing in sackcloth and sprinkling ashes over his head, he publicly apologized and submitted to the bishop. Unlike the absolute authority of Diocletian’s pagan rule, it appeared as if there were limits to what a Christian emperor could do—even one appointed by God. In the first great contest between church and state, the church had emerged victorious.*
Theodosius was appropriately chastened, and he began to take a harder line against the last vestiges of paganism. The Olympic Games, held in honor of the gods for the last thousand years, were canceled, and the Delphic Oracle was officially suppressed. In the Forum of Rome, the eternal fire in the Temple of Vesta was snuffed out, and the vestal virgins were disbanded, provoking outraged citizens to warn of terrible repercussions and divine retribution. For the most part, however, such protests were rare. Though it would cling to some semblance of life for the better part of a century, paganism was clearly moribund.† Christianity had triumphed, and the coup de grâce came in 391, when Theodosius made it the only religion of the Roman Empire.