Mediolanum
In 590 BC, a Celtic tribe known as the Insubres established a settlement called Medhelanon on the fertile plains of northern Italy. This community belonged to the Golasecca culture and thrived near the confluence of rivers that would later define Milan's geography. The name itself meant "settlement in the midst of the plain" when translated from Gaulish roots into Latin as Mediolanum. Roman consul Gnaeus Cornelius Scipio Calvus led legions against these people in 222 BC, capturing their fortified position after fierce resistance. Polybius described the region as abundant with wine, grain, wool, and swine herds that supplied both public markets and private households. Local generosity became legendary among neighboring tribes while Roman engineers began mapping roads radiating outward from this strategic hub. The city grew into Cisalpine Gaul, meaning "Gaul this side of the Alps," establishing trade routes connecting Mediterranean ports to Alpine passes.
Emperor Diocletian relocated the Western Empire capital from Rome to Mediolanum in 286 AD, leaving his colleague Maximian to govern from this northern stronghold. Population numbers surged from 40,000 residents during Augustan times to approximately 100,000 people under imperial rule. A massive stone wall measuring about 4.5 kilometers now encircled an area spanning 375 acres within the new boundaries. Construction included numerous twenty-four-sided towers designed to withstand siege warfare while providing defensive advantages across the entire perimeter. One surviving tower reaches 16.6 meters high inside what is now the convent of San Maurizio Maggiore. Maximian commissioned a gigantic circus measuring 470 by 85 meters alongside thermal baths dedicated to Hercules. These structures transformed the city into one of the largest urban centers throughout all of Roman Italy during the late third century.
The imperial palace complex rose near the modern Castle Sforzesco location at the top left corner of ancient maps showing the original layout. A large amphitheater measured 129.5 by 109.3 meters according to archaeological records preserved today. This structure was not the third largest globally as sometimes claimed but ranked among major entertainment venues alongside Rome and Capua. Horrea warehouses stored grain supplies while a mint produced coins bearing images of emperors like Gallienus starting around 258 AD. The mint eventually transferred operations to Ticinum under Aurelian yet remained one of three great imperial mints alongside Rome and Siscia in Croatia. A horreum warehouse system supported food distribution networks connecting rural producers with urban consumers throughout northern Italy. Imperial mausoleums housed elite families while public buildings incorporated ivory work and silver decorations common in Late Empire artistic projects.
Emperor Constantine issued the Edict of Milan in AD 313 from this northern capital granting religious tolerance across the entire empire. Christian communities had already existed within Mediolanum contributing martyrs during periods of persecution including Saints Gervasius, Protasius, Victor Maurus, Nabor, Felix, Nazarius, Celsus, and Sebastian. Merocles became the first bishop with firm historical presence attending the Council of Rome in 313. Auxentius served as a respected Arian theologian until his death in 374 creating theological divisions among local Christians. Bishop Ambrose prevented dedication of basilicas to Arian worship during Valentinian II's reign establishing Catholic dominance. Basilicas like San Simpliciano, San Nazaro, San Lorenzo, and Sant'Ambrogio emerged in the late fourth century. Ruins of Saint Tecla's ancient church survive beneath the Duomo crypt where St. Augustine received baptism centuries later.
King Alaric I besieged the city in 402 forcing imperial residence relocation to Ravenna while population losses mounted under siege conditions. Attila attacked again in 452 but true devastation arrived during the Gothic War when Uraia laid waste to Mediolanum in 538. Procopius recorded losses reaching 300,000 men during this catastrophic conflict that ended Roman control permanently. The Lombards captured Ticinum renaming it Papia making it their capital instead allowing Early Medieval Milan governance by archbishops alone. Ancient structures crumbled while new powers reshaped political boundaries across northern Italy without preserving previous imperial infrastructure. Trade routes shifted away from former commercial hubs as economic centers moved toward emerging regional capitals throughout the peninsula.
The Chapel of S. Vittore contains Late Antique mosaics visible today within the basilica of Sant'Ambrogio alongside inscriptions collected over centuries. Colonne di San Lorenzo stand before the church of San Lorenzo displaying four surviving columns from ancient times. A tower measuring 16.6 meters high remains inside the Convento di San Maurizio Maggiore representing part of the original circus structure. Scant amphitheater ruins now occupy an archaeological park dedicated to preservation efforts protecting remaining fragments for future study. Moenia walls and twenty-four-sided towers survive at various locations including piazza Missori and beneath modern metro stations. Ruins of the imperial palace lie scattered near current urban development while Baths of Hercules remnants appear in the Civic Archaeological Museum. The body of St. Ambrose died in 397 rests in crypts alongside possibly earlier saints discovered during his lifetime. Modern institutions like Mediolanum Forum at Assago and Corporate University preserve the ancient name through contemporary naming conventions honoring historical continuity.
Common questions
When was Mediolanum established by the Insubres?
The Celtic tribe known as the Insubres established a settlement called Medhelanon in 590 BC on the fertile plains of northern Italy. This community belonged to the Golasecca culture and thrived near the confluence of rivers that would later define Milan's geography.
Why did Emperor Diocletian move the Western Empire capital to Mediolanum in 286 AD?
Emperor Diocletian relocated the Western Empire capital from Rome to Mediolanum in 286 AD leaving his colleague Maximian to govern from this northern stronghold. The city grew into Cisalpine Gaul establishing trade routes connecting Mediterranean ports to Alpine passes while population numbers surged from 40,000 residents during Augustan times to approximately 100,000 people under imperial rule.
What happened to Mediolanum during the Gothic War in 538?
True devastation arrived during the Gothic War when Uraia laid waste to Mediolanum in 538 according to Procopius who recorded losses reaching 300,000 men during this catastrophic conflict. The Lombards captured Ticinum renaming it Papia making it their capital instead allowing Early Medieval Milan governance by archbishops alone after Roman control ended permanently.
Who issued the Edict of Milan in 313 and what was its purpose?
Emperor Constantine issued the Edict of Milan in AD 313 from this northern capital granting religious tolerance across the entire empire. Christian communities had already existed within Mediolanum contributing martyrs during periods of persecution including Saints Gervasius Protasius Victor Maurus Nabor Felix Nazarius Celsus and Sebastian before Merocles became the first bishop with firm historical presence attending the Council of Rome in 313.
Where can visitors see surviving ancient structures of Mediolanum today?
A tower measuring 16.6 meters high remains inside the Convento di San Maurizio Maggiore representing part of the original circus structure while Moenia walls and twenty-four-sided towers survive at various locations including piazza Missori and beneath modern metro stations. Ruins of the imperial palace lie scattered near current urban development while Baths of Hercules remnants appear in the Civic Archaeological Museum alongside Colonne di San Lorenzo standing before the church of San Lorenzo displaying four surviving columns from ancient times.
All sources
12 references cited across the entry
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- 3bookMetropolis and Hinterland: The City of Rome and the Italian Economy, 200 BC-AD 200Neville Morley — Cambridge University Press — 19 December 2002
- 4bookA Companion to Latin StudiesCUP Archive — 1963
- 5bookNorthern Italy, from Alps to FlorenceAlta Macadam et al. — A & C Black — 1971
- 6inlinePolybius, Histories
- 7bookDictionnaire de la langue gauloiseXavier Delamarre — Errance — 2003
- 9journalAmphitheatres of the Roman WorldHerbert W. Benario — 1981
- 10journalThe Mints of the Empire: Vespasian to DiocletianH. Mattingly — 1921
- 12bookHistory of the Later Roman Empire: From the Death of Theodosius I to the Death of JustinianJohn Bagnell Bury — Dover Publications, Inc — 1958