Marcomannic Wars
The Marcomannic Wars were a series of wars lasting from about AD 166 until 180. These wars pitted the Roman Empire against principally the Germanic Marcomanni and Quadi and the Sarmatian Iazyges; there were related conflicts with several other Germanic, Sarmatian, and Gothic peoples along both sides of the whole length of the Roman Empire's northeastern European border, the river Danube.
The struggle against the Germans and Sarmatians occupied the major part of the reign of Roman emperor Marcus Aurelius, and it was during his campaigns against them that he started writing his philosophical work Meditations.
Background
Secure for many years following his ascension to power, the Roman Emperor Antoninus Pius never left Italy; neither did he embark on substantial conquests, all the while allowing his provincial legates to command his legions entirely. Historian Adrian Goldsworthy posits that Pius's reluctance to take aggressive military action throughout his reign may have contributed to Parthian territorial ambitions. The resulting war between Parthia and Rome lasted from 161 to 166 AD and, although it ended successfully, its unforeseen consequences for the Empire were great. The returning troops brought with them a plague, which would eventually kill an estimated 7 to 8 million people, severely weakening the Empire. Despite the consequences of the plague, historian Kyle Harper contends that the event should not be treated as a fatal blow to the Empire. Instead, Rome's resilience was demonstrated since the Empire remained intact and Roman birth rates in the decade following the plague subsequently increased.At the same time, in Central Europe during the second-century AD, the first movements of the Great Migrations were occurring, as the Goths began moving south-east from their ancestral lands at the mouth of River Vistula, putting pressure on the Germanic tribes from the north and east. As a result, Germanic tribes and other nomadic peoples launched raids south and west across Rome's northern border, particularly into Gaul and across the Danube. Whether this sudden influx of peoples with which Marcus Aurelius had to contend was the result of climate change or overpopulation remains unknown. Theories exist that the various Germanic tribes along the periphery of the Empire may have conspired to test Roman resolve as part of an attempt to bring to possible fruition Arminius's dream of a future united Germanic empire.
Up until these subsequent wars, the Marcomanni and Quadi generally enjoyed amicable relations and access to the Empire's wares—archaeological evidence of Roman household goods and practices illustrate such contact. As with almost all areas within the Empire's reach, the Romans aimed for a combination of military–territorial dominance, while at the same time engaging in mutually beneficial commerce. However, the Marcomanni did not want to submit to Roman territorial dominance or be annexed; instead, they sought "incorporation into the Roman Empire" with favorable economic terms—something Marcus was not willing to tolerate since it went against his policy of dividing and ruling his erstwhile competitors. Eagerness on the part of the Marcommani for terms perhaps left Marcus too comfortable to the degree that he never anticipated any initial aggressive moves from them.
History
First Marcomannic War
Initial invasions
By the early 160s AD, mounting pressures along the Rhine and Danube frontiers led several Germanic tribes to invade Roman territory. Between 162 and 165, incursions by the Chatti and Chauci into Raetia and Germania Superior were repelled. In late 166, thousands of Langobardi and Lacringi crossed into Pannonia. These movements increased pressure on other tribes along the Roman frontier.The invaders were quickly defeated by local forces, including detachments from the Legio I Adiutrix under a commander named Candidus and the Ala Ulpia contariorum under Marcus Macrinius Avitus Catonius Vindex. Despite the swift victory, the incursion marked the beginning of a broader crisis. Marcus Iallius Bassus, governor of Pannonia, initiated negotiations with eleven tribes. The Marcomannic king Ballomar, a Roman client, mediated and dismissed the raid as unrepresentative. A truce was reached and the tribes withdrew, though no permanent agreement followed. As Rome was still engaged in war with Parthia, the resolution—considered a bellum suspensum—was seen as a diplomatic success, though the identities of the original raiders remain uncertain.
First Roman expedition in Pannonia (168)
The Antonine Plague severely limited Roman responses in the late 160s. A punitive expedition planned by Marcus Aurelius was postponed until 168. That spring, Marcus and Lucius Verus departed Rome and established headquarters at Aquileia. They reorganized defenses in Italy and Illyricum, raised the Legio II Italica and Legio III Italica, and crossed the Alps into Pannonia. The approach of the imperial army reportedly prompted the Marcomanni and Victuali to withdraw and pledge good conduct. The emperors returned to Aquileia for winter quarters, but in January 169, Lucius Verus suffered a fatal stroke en route and died. Marcus returned to Rome to oversee his funeral and deification.Campaign against the Iazyges and the Germanic invasion of Italy
In autumn 169, Marcus Aurelius, accompanied by his son-in-law Claudius Pompeianus, resumed the campaign. To finance the war effort, Marcus auctioned off imperial property—a measure historian Michael Kulikowski describes as the only viable alternative to raising taxes. The primary Roman objective was to punish the Iazyges, a Sarmatian people inhabiting the region between the Danube and Roman Dacia. Early in the campaign, the Iazyges killed Marcus Claudius Fronto, the governor of Lower Moesia.While the Roman army was preoccupied, other tribes launched opportunistic raids across the frontier. In the east, the Costoboci crossed the Danube, pillaging Thrace and reaching as far south as Eleusis, where they destroyed the sanctuary of the Eleusinian Mysteries, but Rome reclaimed the Balkans with support from the port of Salonae in Dalmatia.
A more serious threat came from the Marcomanni in the west. Led by King Ballomar, they formed a coalition of Germanic tribes, crossed the Danube, and defeated a Roman force of 20,000 near Carnuntum, in what is sometimes called the Battle of Carnuntum. They then advanced south, ravaging Noricum and reaching northern Italy. The Marcomanni destroyed Oderzo and besieged Aquileia, marking the first hostile incursion into Italy since the Cimbri invasion of 101 BC. Titus Furius Victorinus, the Praetorian prefect, attempted to relieve the city but was defeated and likely killed, though some sources attribute his death to plague.
Roman counter-offensive and defeat of the Marcomanni
In response to the Marcomannic invasion, Marcus Aurelius reoriented Roman priorities and dispatched reinforcements from other frontiers. Command was entrusted to Tiberius Claudius Pompeianus, with the future emperor Pertinax serving under him. A new defensive zone, the Praetentura Italiae et Alpium, was established to safeguard northern Italy, and the Danube fleet was strengthened. Aquileia was relieved, and by late 171, invading forces had been expelled from Roman territory. Meanwhile, Rome pursued diplomatic efforts to divide its adversaries. Peace treaties were signed with the Quadi and Iazyges, while the Hasdingi Vandals and Lacringi became Roman allies.During 172, Roman forces crossed the Danube into Marcomannic territory to push back the invasions undertaken by the various Germanic peoples. Although specific details are scarce, the campaign resulted in the subjugation of the Marcomanni and their allies, the Naristi and the Cotini. Marcus Aurelius added the title "Germanicus" to his cognomen.
By 173, the Romans began to turn on the Quadi, who had violated their treaty. The campaign culminated in the so-called "Miracle of the Rain," in which the surrounded Legio XII Fulminata was saved by a sudden storm. Ancient accounts differ: Cassius Dio attributed the event to an Egyptian magician invoking Mercury, while Christian writers like Tertullian claimed it was the result of Christian prayer.
In the same year, Didius Julianus, commanding the Rhine frontier, repelled invasions by the Chatti and Hermunduri, while the Chauci raided the coast of Gallia Belgica.
In 174, another campaign was launched against the Quadi. After deposing the pro-Roman king Furtius, they elevated Ariogaesus, whom Marcus refused to recognize. Marcus captured and exiled him to Alexandria. The Quadi were subdued and compelled to provide hostages, auxiliary troops, and accept Roman garrisons.Following the subjugation of the Quadi, Marcus Aurelius focused on the Iazyges, who occupied the plains along the Tisza River—a campaign known as the expeditio sarmatica. After a series of Roman victories, the Iazyges surrendered in 175. Their king, Zanticus, returned 100,000 Roman prisoners and provided 8,000 cavalry auxiliaries, of whom 5,500 were dispatched to Britain. In recognition of the victory, Marcus adopted the title "Sarmaticus".
Marcus may have intended to consolidate the region by forming two new provinces, Marcomannia and Sarmatia, incorporating modern-day Czech Republic and Slovakia. However, these plans were interrupted by the rebellion of Avidius Cassius, governor of Syria, who declared himself emperor.
Marcus marched east with his army, accompanied by auxiliary detachments from the Marcomanni, Quadi, and Naristi, under the command of Marcus Valerius Maximianus. After suppressing the revolt, Marcus returned to Rome—the first time in nearly eight years. On 23 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 commemorate the campaigns, modeled after Trajan's Column.