Siege of Pavia (773–774)

Lore & Background

Charlemagne, rex Francorum, had succeeded to the throne in 768 jointly with his brother Carloman. At the time there was antagonism between not only the two ruling brothers, but between the king of the Lombards, Desiderius, and the papacy. In 772, Pope Hadrian I expelled all the Lombard officials from the papal curia. In response, Desiderius invaded papal territory, even taking Otriculum (modern Otricoli), just a day's march from Rome. Hadrian called Charlemagne for assistance. Charles had produced an alliance with the Lombards by marrying one of Desiderius' daughters, Desiderata; within a year, however, he had changed his mind about the marriage and alliance, and divorced his wife, sending her back to her father. This was taken as an insult by the Lombards. Upon the death of Carloman in 771, his own wife, Gerberge, fled the kingdom with her children for reasons now unclear (Einhard disingenuously protests that she spurned her husband's brother 'for no reason at all') and sought refuge with Desiderius at Pavia. Desiderius now returned the insult to the Franks by giving her asylum, and protesting that her children be allowed their share of the Kingdom of the Franks. The relationship between Frank and Lombard now broke down completely and the pope took full advantage. His embassy landed at Marseille and travelled to Thionville, where they delivered this message: Charlemagne ascertained the truth of Desiderius' aggressions and the threat he posed to his own Frankish realm and marched his troops towards Italy in the early summer of 773. Charles' army had 10,000–40,000 troops; he divided it in half, giving command of one half to his uncle, Bernard, son of Charles Martel, and led it through the Alpine passes; he through that of the Dora Susa near Mont Cenis, and Bernard through the Great St Bernard Pass. At the foot of the mountains, Charles' army met the fortifications of Desiderius, but scouting forces found an alternate route. A cavalcade was sent to attack the defenders from the flank and, with Bernard's forces approaching from the east, the Lombards fled to fortified Pavia. The Frankish troops then marched on to begin the siege of Pavia by September. The Frankish army, while often using cavalry in campaigns, also adopted attrition siege tactics with rudimentary engines likely planning for prolonged encirclement through vallation and contra-vallation to this he

Reader's Guide

The siege of Pavia (773–774) was a Frankish victory under Charlemagne against the Lombards under King Desiderius. The siege ended with Desiderius surrendering in the tenth month, after famine struck Pavia. Charlemagne then took the title 'King of the Franks and Lombards'.

Did You Know?

• Charlemagne divorced Desiderius' daughter Desiderata within a year of marriage, sending her back to her father.
• The Frankish army used attrition siege tactics, blocking resupply and causing starvation and disease among the Lombards.
• A fresco in the church of San Teodoro in Pavia depicts Saint Theodore flooding the Frankish camp, forcing Charlemagne to abandon the siege—a local legend that modifies the real outcome.
• The small church of Santa Sofia (Torre d'Isola) is said by legend to have been built by Charlemagne in one day during the siege.

The Collapse of a Fragile Alliance

Charlemagne's relationship with the Lombard kingdom had always been precarious. In 768, he shared the Frankish throne with his brother Carloman while simultaneously maintaining a dynastic bond to King Desiderius through his marriage to Desiderata, one of Desiderius's daughters. Yet within a year of that union, Charles repudiated the marriage, sending his wife back to her father—an act the Lombards interpreted as a grave personal insult. The situation deteriorated further after Carloman died in 771. His wife Gerberge fled the Frankish realm with their children and sought shelter at Desiderius's court in Pavia. Desiderius, returning the insult, granted her asylum and demanded that her children receive their inheritance in the Frankish kingdom. Simultaneously, the papacy found itself under direct threat: in 772, Pope Hadrian I had expelled Lombard officials from the papal curia, prompting Desiderius to invade papal lands and seize Otriculum, barely a day's march from Rome. Hadrian dispatched an embassy that traveled from Marseille to Thionville, pleading with Charlemagne to intervene before Rome itself fell. Convinced of the genuine danger to both the papacy and his own realm, Charles assembled his forces and marched toward Italy in the early summer of 773.

Two Armies Through the Alps

Rather than committing his entire force down a single mountain route, Charles split his army—numbering somewhere between ten and forty thousand men—into two columns. He personally led one half through the Dora Susa valley near Mont Cenis, while his uncle Bernard, son of Charles Martel, took the other through the Great St Bernard Pass. At the base of the mountains, the Lombards had erected fortifications to block the Frankish advance, but scouting parties discovered an alternate path. A cavalry detachment struck the defenders from the flank while Bernard's column closed in from the east, scattering the Lombard field force and driving them back behind the walls of fortified Pavia. By September, the Franks had established their siege lines. Though the Frankish army was renowned for its cavalry, Charles adopted a methodical attrition strategy against the heavily walled city, employing rudimentary siege engines and constructing both vallation and contra-vallation works to encircle the position for a prolonged campaign. Cut off from resupply with the surrounding countryside firmly in Frankish hands, the garrison within Pavia slowly succumbed to starvation and disease, while no Lombard duke or count mounted a relief effort and Desiderius never launched a decisive counterattack.

A New King, A New Order

When the tenth month of starvation finally broke Desiderius's resolve, the former Lombard king opened the gates of Pavia on a Tuesday in June 774 and surrendered to Charles. In the aftermath, Charlemagne performed an act without precedent among the Germanic kingdoms of the Early Middle Ages: he had himself proclaimed rex Langobardorum, absorbing the title of the conquered dynasty into his own. From that point forward, he styled himself King of the Franks and Lombards, a formulation that signaled something far more ambitious than mere territorial annexation. He was forging what modern historians would recognize as a true empire, and he did so in deliberate alliance with the Roman Church as its spiritual protector. His formal recognition of temporal papal authority over central Italian territories helped lay the groundwork for the medieval Papal state. The political reshaping of Italy was swift and profound. Frankish nobles filled positions of power throughout the peninsula, yet many Lombards who accepted Charles's rule retained their existing offices. As the military historian Paul K. Davis observed, the destruction of the Lombard monarchy removed Rome's most persistent security threat and laid the groundwork for what would become the Holy Roman Empire.

Pavia Remembers

The siege left an indelible mark on the urban identity of Pavia, where the memory of Lombard sovereignty as the city's capital defined its self-image for centuries. Physical traces endure: sections of the original first city walls still stand along via dei Mulini, silent witnesses to the encirclement. More strikingly, a later artistic tradition rewrote the siege's outcome. In 1514, the rector Giovanni Luchino Corti commissioned an anonymous Lombard painter to fresco the right aisle of the church of San Teodoro with a cycle depicting the life of Saint Theodore of Pavia. In this cycle, the holy bishop causes the waters of the Ticino to swell, flooding the Frankish camp and forcing Charlemagne to abandon the siege entirely. Commissioned during a period of intense uncertainty over the duchy of Milan's future amid the Italian wars, the altered narrative served to assert the city's autonomy, as though the Lombard kingdom had never truly fallen. A separate legend, rooted in the chronicle of Notker the Stammerer, holds that Charlemagne built the small church of Santa Sofia at Torre d'Isola in a single day during the siege to attend divine services, though a royal residence certainly existed there by the ninth century under Louis II of Italy.