Marcomannic Wars

• 1. Introduction

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  The Marcomannic Wars began in about AD 166, when the Roman Empire found itself fighting for its northern border in a way it had not faced for generations. On one side stood the legions of Rome. On the other: the Germanic Marcomanni and Quadi, the Sarmatian Iazyges, and a shifting coalition of other peoples stretching across the entire length of the Danube frontier. The man at the center of it all was the philosopher-emperor Marcus Aurelius, and the conflict would consume the greater part of his reign. It also pushed him to begin writing what would become one of antiquity's most enduring philosophical texts, his Meditations. How did the mightiest empire in the Western world end up fighting on multiple fronts at once, facing an invasion that reached the soil of Italy itself for the first time since 101 BC? And what kind of emperor wages war while writing philosophy? The answers lie in a cascade of events stretching from the plains of Central Europe to the streets of a plague-struck Rome.

• 2. A World Set in Motion

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  Before a single spear was thrown across the Danube, forces far beyond Roman control were already reshaping the world to the north. The Goths were moving south-east from their ancestral homeland near the mouth of the River Vistula, a migration tied to what archaeologists trace through the Wielbark culture. Their movement pressed against Germanic tribes from the north and east, setting off a chain of displacement that sent peoples raiding south and west, into Gaul and across Rome's river frontier. Whether climate change or overpopulation drove this surge remains unknown to historians. Some have theorized that the Germanic tribes along the imperial periphery may have been testing Roman resolve in pursuit of Arminius's old dream of a united Germanic empire. What is known is that for years before the fighting started, the Marcomanni and Quadi had maintained generally amicable relations with Rome. Archaeological evidence of Roman household goods found among them points to active trade. But the Marcomanni drew a line: they wanted incorporation into the Roman Empire on favorable economic terms, not territorial submission. Marcus Aurelius refused. His policy was to divide and rule his competitors, not absorb them as partners. The resulting tension would prove far more dangerous than Rome anticipated.

• 3. Plague Before the Storm

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  The war between Rome and Parthia, which ran from 161 to 166 AD under the joint rule of Marcus Aurelius and Lucius Verus, ended in Roman success. But the returning troops brought something far more destructive than any defeated enemy. The Antonine Plague, as it came to be known, would eventually kill an estimated 7 to 8 million people and severely weaken the Empire. Historian Kyle Harper has argued against reading the plague as a fatal blow; Rome survived, and birth rates in the decade after the epidemic subsequently increased. Yet the damage to military capacity was real and immediate. The punitive expedition Marcus Aurelius planned in response to early Germanic incursions had to be postponed until 168 precisely because the plague had strangled Roman options. Emperor Antoninus Pius, who preceded Marcus, had never left Italy during his reign and had refrained from aggressive military action throughout. Historian Adrian Goldsworthy has suggested this restraint may have encouraged Parthian territorial ambitions in the first place, setting the dominoes in motion. By the time Marcus Aurelius had to act on the Danube, he was working with a treasury strained by the Parthian war and a population battered by disease. To finance the coming campaigns, he eventually resorted to auctioning off imperial property, a measure historian Michael Kulikowski called the only viable alternative to raising taxes.

• 4. Fire Along the Danube

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  In late 166, thousands of Langobardi and Lacringi crossed into Pannonia, and local Roman forces moved swiftly to defeat them. Among the units involved were detachments from the Legio I Adiutrix under a commander named Candidus and the Ala Ulpia contariorum under Marcus Macrinius Avitus Catonius Vindex. The Marcomannic king Ballomar, who held status as a Roman client, stepped in to mediate, dismissed the raid as unrepresentative, and helped broker a truce. The Romans treated the outcome as a diplomatic success, calling it a bellum suspensum, a war held in suspension. The calm was brief. By 168, Marcus and his co-emperor Lucius Verus departed Rome and established headquarters at Aquileia, raised two new legions, the Legio II Italica and Legio III Italica, and crossed the Alps into Pannonia. Their approach alone reportedly caused the Marcomanni and the Victuali to withdraw and promise good behavior. That winter, however, Lucius Verus suffered a fatal stroke and died in January 169. Marcus returned to Rome for the funeral, and when he resumed the campaign in autumn of that year, he brought with him his son-in-law Claudius Pompeianus. Then came the crisis no one had anticipated. Led by King Ballomar, a coalition of Germanic tribes crossed the Danube, defeated a Roman force of 20,000 near Carnuntum, and drove south through Noricum all the way into northern Italy. They destroyed the city of Oderzo and besieged Aquileia, the first hostile force to reach Italian soil since the Cimbri invasion of 101 BC. The Praetorian prefect Titus Furius Victorinus attempted to relieve Aquileia and was defeated, likely killed, though some ancient sources attribute his death to plague rather than battle.

• 5. The Long Counterattack

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  Marcus Aurelius responded to the invasion of Italy by reshuffling his military priorities across the entire empire. Overall command in the west went to Tiberius Claudius Pompeianus, and the future emperor Pertinax served under him. Rome established a new defensive structure called the Praetentura Italiae et Alpium to protect northern Italy, and the Danube fleet was reinforced. Aquileia was relieved, and by late 171, Roman forces had expelled the invaders from Italian territory. Diplomacy ran parallel to the fighting. Rome negotiated separate peace treaties with the Quadi and Iazyges, and the Hasdingi Vandals and Lacringi were brought in as Roman allies, fracturing the coalition. In 172, Roman armies crossed the Danube into Marcomannic territory and ultimately subjugated the Marcomanni along with their allies the Naristi and the Cotini. Marcus took the victory title "Germanicus." The campaign against the Quadi, which followed in 173, produced one of the most argued episodes of the whole war. A Roman unit, the Legio XII Fulminata, found itself surrounded, and then a sudden storm broke over the battlefield. Cassius Dio attributed the deliverance to an Egyptian magician invoking Mercury. Christian writers, including Tertullian, credited Christian prayer among the soldiers. Whatever the explanation, the incident entered history as the "Miracle of the Rain." In 174 the Quadi had deposed their pro-Roman king Furtius and replaced him with Ariogaesus, whom Marcus refused to recognize. Marcus captured Ariogaesus and sent him into exile in Alexandria. The Quadi were then forced to give hostages, contribute auxiliary troops, and accept Roman garrisons on their territory. The Iazyges, who inhabited the plains along the Tisza River, surrendered in 175 after a dedicated campaign Marcus named the expeditio sarmatica. Their king Zanticus returned 100,000 Roman prisoners and provided 8,000 cavalry auxiliaries, of whom 5,500 were sent to Britain.

• 6. Triumph and Interruption

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  With the Iazyges defeated, Marcus Aurelius may have contemplated forming two entirely new Roman provinces, Marcomannia and Sarmatia, covering what is now the Czech Republic and Slovakia. The idea would have pushed Roman governance north of the Danube on a permanent basis. It never happened. The rebellion of Avidius Cassius, the governor of Syria, forced Marcus to abandon his northern plans. Cassius had declared himself emperor, and Marcus marched east with an army that included auxiliary detachments from the Marcomanni, Quadi, and Naristi under Marcus Valerius Maximianus. After suppressing the revolt, Marcus returned to Rome for the first time in nearly eight years. On the 23rd of December 176, he and his son Commodus celebrated a joint triumph for victories over the Germans and Sarmatians. The Column of Marcus Aurelius was later erected in Rome to mark the campaigns, modeled after Trajan's Column. The respite lasted barely a year. In 177, the Quadi rebelled again, and the Marcomanni joined them. Marcus marched north once more, launching what was called the secunda expeditio Germanica. He arrived at Carnuntum in August 178 and led forces into hostile territory, striking first the Marcomanni, then turning on the Quadi between 179 and 180. At a decisive engagement near Laugaricio, the site of modern-day Trencin in Slovakia, Marcus Valerius Maximianus led Roman forces to victory. The survivors fled deeper into Germania Magna, where the praetorian prefect Publius Tarrutenius Paternus secured another major win. On the 17th of March 180, Marcus Aurelius died at Vindobona, the city now called Vienna. His son Commodus had no appetite for further fighting. He negotiated peace with the Marcomanni and Quadi, returned to Rome, and celebrated a triumph on the 22nd of October 180.

• 7. What the Wars Left Behind

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  After the wars ended, Rome reorganized its northern defenses in a way that reflected just how exposed the frontier had proved to be. Sixteen of the Empire's thirty-three legions were stationed along the Rhine and Danube, half of total Roman military strength committed to holding that single boundary. Germanic settlement within the frontier zones of Dacia, Pannonia, Germania, and parts of Italy increased substantially. The scale of this integration was new enough to require fresh administrative responses. Plans for the provinces of Marcomannia and Sarmatia, incorporating territory in what is now the Czech Republic and Slovakia, were discussed again but never executed. Not all the resettlement went smoothly. A group of Germanic settlers in Ravenna rebelled and briefly seized control of the city, prompting Marcus Aurelius to ban further settlement of what Roman sources called "barbarians" in Italy and to expel those already present. In the broader sweep of history, scholars have read the Marcomannic Wars as a preview of much larger things to come. The conflicts foreshadowed the large-scale invasions of the 4th and 5th centuries that would contribute to the disintegration of the Western Roman Empire. The column Marcus Aurelius had built in Rome to commemorate his victories still stands, its carved friezes recording a war that, despite the triumph it celebrated, marked the moment Rome's long northern horizon began to close in.