The Danube frontier
Rome's northeastern border on the river Danube, where the Marcomannic Wars were fought from about 166 to 180 CE.
were a series of wars lasting from about CE 166 until 180
along both sides of the whole length of the Roman Empire's northeastern European border, the river Danube
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
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In short
Rome fought mainly the Germanic Marcomanni and Quadi and the Sarmatian Iazyges here, c. 166–180 CE.
were a series of wars lasting from about CE 166 until 180. These wars pitted the Roman Empire against principally the Germanic Marcomanni and Quadi and the Sarmatian Iazyges
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
The fighting took up most of the reign of the emperor Marcus Aurelius.
The struggle against the Germans and Sarmatians occupied the major part of the reign of Roman emperor Marcus Aurelius
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
During these campaigns Marcus Aurelius started writing his philosophical work, the Meditations.
it was during his campaigns against them that he started writing his philosophical work Meditations
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
Why it started
Troops returning from the war between Parthia and Rome (161–166 CE) brought the Antonine Plague, which badly weakened the Empire.
The resulting war between Parthia and Rome lasted from 161 to 166 AD (under the joint rule of Marcus Aurelius and Lucius Verus) and, although it ended successfully, its unforeseen consequences for the Empire were great.
The returning troops brought with them a plague (the so-called Antonine Plague), which would eventually kill an estimated 7 to 8 million people, severely weakening the Empire.
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
Goths moving south-east put pressure on the Germanic tribes. Germanic tribes raided across Rome's northern border.
as the Goths began moving south-east from their ancestral lands at the mouth of River Vistula (see Wielbark culture), 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.
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
How it went
In late 166 CE thousands of Langobardi and Lacringi crossed into Pannonia; local forces quickly beat them.
In late 166, thousands of Langobardi and Lacringi (possibly the Obii) crossed into Pannonia.
The invaders were quickly defeated by local forces
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
The Marcomanni, led by King Ballomar, formed a coalition, crossed the Danube and beat a Roman force of 20,000 near Carnuntum.
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
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
The Marcomanni besieged Aquileia, the first hostile incursion into Italy since the Cimbri invasion of 101 BCE.
The Marcomanni destroyed Oderzo (Opitergium) and besieged Aquileia, marking the first hostile incursion into Italy since the Cimbri invasion of 101 BC.
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
By late 171 CE the invaders had been expelled from Roman territory.
by late 171, invading forces had been expelled from Roman territory
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
By 173 CE Rome began to turn on the Quadi, who had broken their treaty. The campaign culminated in the Miracle of the Rain: a storm saved a surrounded legion.
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.
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
The Iazyges surrendered in 175 CE, and their king Zanticus returned 100,000 Roman prisoners.
After a series of Roman victories, the Iazyges surrendered in 175. Their king, Zanticus, returned 100,000 Roman prisoners
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
How it ended
The Quadi rebelled in 177 CE, soon joined by the Marcomanni, and Marcus Aurelius marched north again.
In 177, the Quadi rebelled, soon joined by the Marcomanni. Marcus once again marched north to launch a second campaign
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
Marcus Aurelius died at Vindobona (modern Vienna) on 17 March 180 CE.
However, on 17 March 180, Marcus Aurelius died at Vindobona (modern Vienna).
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
His son Commodus, ignoring his generals, made peace with the Marcomanni and Quadi.
His son and successor, Commodus, showed little interest in continuing the campaign. Ignoring the counsel of his generals, Commodus negotiated peace with the Marcomanni and Quadi.
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
Afterwards, 16 of the Empire's 33 legions were stationed along the Rhine and Danube.
Thereafter, half of the Empire’s legions (16 out of 33) were stationed along the Rhine and Danube.
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
The wars foreshadowed the invasions of the 4th and 5th centuries that helped break up the Western Roman Empire.
the Marcomannic Wars foreshadowed the large-scale invasions of the 4th and 5th centuries that would contribute to the disintegration of the Western Roman Empire
From Wikipedia, Marcomannic Wars (opens en.wikipedia.org), as of 2026-09-24.
Related
Events
Said in the Danube frontier
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