The Battle of

Mediolanum Mediolanum, the ancient city where Milan now stands, was originally an Insubrian city, but afterwards became an important Roman city in northern Italy. The city was settled by the Insubres around 600 BC, conquered by the Romans in 222 BC, and ...

took place in 259, between the

Alemanni The Alemanni or Alamanni, were a confederation of Germanic tribes * * * on the Upper Rhine River. First mentioned by Cassius Dio in the context of the campaign of Caracalla of 213, the Alemanni captured the in 260, and later expanded into pres ...

and the

Roman legions The Roman legion ( la, legiō, ) was the largest military unit of the Roman army, composed of 5,200 infantry and 300 equites (cavalry) in the period of the Roman Republic (509 BC–27 BC) and of 5,600 infantry and 200 auxilia in the period of ...

under the command of

Emperor An emperor (from la, imperator, via fro, empereor) is a monarch, and usually the sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife ( empress consort), mother ( ...

Gallienus Publius Licinius Egnatius Gallienus (; c. 218 – September 268) was Roman emperor with his father Valerian from 253 to 260 and alone from 260 to 268. He ruled during the Crisis of the Third Century that nearly caused the collapse of the empi ...

Background

When Roman Emperor Valerian rose to power in October 253, he had his son

elevated to the position of co-emperor. While Valerian was fighting against the

Sassanid Empire The Sasanian () or Sassanid Empire, officially known as the Empire of Iranians (, ) and also referred to by historians as the Neo-Persian Empire, was the History of Iran, last Iranian empire before the early Muslim conquests of the 7th-8th cen ...

and the

Goths The Goths ( got, 𐌲𐌿𐍄𐌸𐌹𐌿𐌳𐌰, translit=''Gutþiuda''; la, Gothi, grc-gre, Γότθοι, Gótthoi) were a Germanic people who played a major role in the fall of the Western Roman Empire and the emergence of medieval Euro ...

, who by that time had sacked

Thrace Thrace (; el, Θράκη, Thráki; bg, Тракия, Trakiya; tr, Trakya) or Thrake is a geographical and historical region in Southeast Europe, now split among Bulgaria, Greece, and Turkey, which is bounded by the Balkan Mountains to ...

and

Asia Minor Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The re ...

, Gallienus remained in Italia, in charge of defending the

Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post-Roman Republic, Republican period of ancient Rome. As a polity, it included large territorial holdings aro ...

's borders there from Germanic tribes ("

barbarians A barbarian (or savage) is someone who is perceived to be either uncivilized or primitive. The designation is usually applied as a generalization based on a popular stereotype; barbarians can be members of any nation judged by some to be les ...

"). In the Western half of the Empire, the border situation was difficult. The Danubian frontier faced continuous barbarian attacks. Gallienus marched with military reinforcements from

Gaul Gaul ( la, Gallia) was a region of Western Europe first described by the Romans. It was inhabited by Celtic and Aquitani tribes, encompassing present-day France, Belgium, Luxembourg, most of Switzerland, parts of Northern Italy (only during ...

towards

Dacia Dacia (, ; ) was the land inhabited by the Dacians, its core in Transylvania, stretching to the Danube in the south, the Black Sea in the east, and the Tisza in the west. The Carpathian Mountains were located in the middle of Dacia. It ...

and

Moesia Moesia (; Latin: ''Moesia''; el, Μοισία, Moisía) was an ancient region and later Roman province situated in the Balkans south of the Danube River, which included most of the territory of modern eastern Serbia, Kosovo, north-eastern Alban ...

to confront the barbarian threat. The situation was so perilous that in 259, the

legion Legion may refer to: Military * Roman legion, the basic military unit of the ancient Roman army * Spanish Legion, an elite military unit within the Spanish Army * Legion of the United States, a reorganization of the United States Army from 179 ...

s of

Pannonia Pannonia (, ) was a province of the Roman Empire bounded on the north and east by the Danube, coterminous westward with Noricum and upper Italy, and southward with Dalmatia and upper Moesia. Pannonia was located in the territory that is now west ...

and Moesia rebelled and declared Ingenuus as emperor. Gallienus eventually reunited the

Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , source ...

, left behind

Legio II Parthica Legio II Parthica ("Parthian-conquering Second Legion") was a legion of the Imperial Roman army founded in AD 197 by the emperor Septimius Severus (r. 193–211), for his campaign against the Parthian Empire, hence the '' cognomen'' ''Parthica'' ...

to defend it, and went off to subdue the barbarians.

Preliminary moves

Within the borders of the

River and the

Alps The Alps () ; german: Alpen ; it, Alpi ; rm, Alps ; sl, Alpe . are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately across seven Alpine countries (from west to east): France, Sw ...

, a Germanic

confederation A confederation (also known as a confederacy or league) is a union of sovereign groups or states united for purposes of common action. Usually created by a treaty, confederations of states tend to be established for dealing with critical iss ...

, the

Alamanni The Alemanni or Alamanni, were a confederation of Germanic tribes * * * on the Upper Rhine River. First mentioned by Cassius Dio in the context of the campaign of Caracalla of 213, the Alemanni captured the in 260, and later expanded into pre ...

, who occupied a good part of the

Agri Decumates The ''Agri Decumates'' or ''Decumates Agri'' ("Decumatian Fields") were a region of the Roman Empire's provinces of Germania Superior and Raetia, covering the Black Forest, Swabian Jura, and Franconian Jura areas between the Rhine, Main, and Da ...

(the territory located between the mouth of the Rhine and the Danube), crossed the Alpine passes and attacked the fertile plain of the

Po River The Po ( , ; la, Padus or ; Ancient Ligurian: or ) is the longest river in Italy. It flows eastward across northern Italy starting from the Cottian Alps. The river's length is either or , if the Maira, a right bank tributary, is included. T ...

. The sacking of the area instilled fear in the city of

Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus ( legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...

, the empire's capital, as it had yet to become a

walled city A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fortifications with towers, bastions and gates ...

. The

Senate of Rome The Roman Senate ( la, Senātus Rōmānus) was a governing and advisory assembly in ancient Rome. It was one of the most enduring institutions in Roman history, being established in the first days of the city of Rome (traditionally founded in ...

hastily organized a contingency of

plebs In ancient Rome, the plebeians (also called plebs) were the general body of free Roman citizens who were not patricians, as determined by the census, or in other words " commoners". Both classes were hereditary. Etymology The precise origins ...

for combat in an attempt to ensure that the shrinking army was capable of protecting the city. Gallienus had just defeated the pretender Ingenuus when news arrived of the invasion by the Alamanni. He marched off with the legions I Adiutrix, II Italica, and II Parthica to intercept the barbarians in Italy. By then, according to the

Byzantine The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...

historian

Joannes Zonaras Joannes or John Zonaras ( grc-gre, Ἰωάννης Ζωναρᾶς ; 1070 – 1140) was a Byzantine Greek historian, chronicler and theologian who lived in Constantinople (modern-day Istanbul, Turkey). Under Emperor Alexios I Komnenos he hel ...

, the Alamanni had retreated before the unexpected resistance of the citizens of Rome and its Senate.

Battle

When Gallienus arrived in the Po valley, he found the Alamanni in the vicinity of

, present day

Milan Milan ( , , Lombard: ; it, Milano ) is a city in northern Italy, capital of Lombardy, and the second-most populous city proper in Italy after Rome. The city proper has a population of about 1.4 million, while its metropolitan city ...

. According to Zonaras, 300,000 Alamanni fell in the ensuing battle and the emperor received the title

Germanicus Germanicus Julius Caesar (24 May 15 BC – 10 October AD 19) was an ancient Roman general, known for his campaigns in Germania. The son of Nero Claudius Drusus and Antonia the Younger, Germanicus was born into an influential branch of the pa ...

Maximus.

Aftermath

The Alamanni's success in attacking into the Roman Empire once more revealed the weakness of the centuries-old tradition of posting Rome's legions near the frontiers without providing adequate defence within the empire's borders. The battle of Mediolanum demonstrated to the Romans the vulnerability of Italy and the value of swift, flexible military units. Afterward, Gallienus enacted a major reform by introducing a highly mobile field army composed mainly of

cavalry Historically, cavalry (from the French word ''cavalerie'', itself derived from "cheval" meaning "horse") are soldiers or warriors who fight mounted on horseback. Cavalry were the most mobile of the combat arms, operating as light cavalry in ...

(

vexillatio A ''vexillatio'' (plural ''vexillationes'') was a detachment of a Roman legion formed as a temporary task force created by the Roman army of the Principate. It was named from the standard carried by legionary detachments, the ''vexillum'' (plural ...

nes). The main units were under the control of his general,

Aureolus Aureolus was a Roman military commander during the reign of Emperor Gallienus before he attempted to usurp the Roman Empire. After turning against Gallienus, Aureolus was killed during the political turmoil that surrounded the Emperor's assassina ...

, and headquartered in Mediolanum, with the mission to protect Italy. The barbarian attack led the Roman Senate to try to regain its authority by arming and commanding its own military forces to meet the Germanic threat. But, uncomfortable with this challenge to his power, Emperor Gallienus suppressed all of the senate's military prerogatives. The fear caused by the incursion later resulted in Emperor

Aurelian Aurelian ( la, Lucius Domitius Aurelianus; 9 September 214 October 275) was a Roman emperor, who reigned during the Crisis of the Third Century, from 270 to 275. As emperor, he won an unprecedented series of military victories which reunited ...

having a

wall A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or, is decorative. There are many kinds of walls, including: * Walls in buildings that form a fundamental part of the s ...

constructed to defend the city of Rome itself.

References

{{reflist

Bibliography

*Francesco Bertolini. ''Historia de Roma''. *Michael Grant. ''Gli Imperatori Romani''. *José M Roldán, José María Blázquez, Arcadio del Castillo. ''Historia de Roma, Tomo II El Imperio Romano''. *José Manuel Roldán. ''Historia de Roma''. *''

Historia Augusta The ''Historia Augusta'' (English: ''Augustan History'') is a late Roman collection of biographies, written in Latin, of the Roman emperors, their junior colleagues, designated heirs and usurpers from 117 to 284. Supposedly modeled on the si ...

''. *

. ''Epitome Historiarum''.

Crisis of the Third Century

History of Milan 259