Charlemagne’s invasion of the Lombard kingdom led to the encirclement of Pavia (the Lombard capital) beginning in September 773, initiating a long siege that became decisive for Frankish control of northern Italy.
During the Lombard campaign, Adalgis (Adelchis) withdrew to Verona and ultimately escaped to Constantinople rather than face capture, removing a key Lombard dynastic rival from Italy as Charlemagne tightened control.
In 774, Charlemagne reaffirmed earlier Frankish grants to the papacy (associated with the Donation of Pippin), reinforcing papal temporal claims in central Italy alongside Carolingian military protection.
By Easter 774, Charlemagne was in Rome and was honored by Pope Hadrian I; the visit underscored the Frankish–papal alliance and framed the conquest of the Lombards as protective of the papacy.
Pavia surrendered on 5 June 774, and Lombard King Desiderius was captured, ending the Lombard kingdom’s independence and marking a major expansion of Carolingian power in Italy.
Immediately after victory, Charlemagne adopted the title rex Langobardorum (“King of the Lombards”), creating a personal union of the Frankish and Lombard crowns and redefining rulership in Italy under Carolingian supremacy.
Charlemagne installed his son Pepin (originally named Carloman) as king of Italy in 781, formalizing a Carolingian sub-kingship that helped administer the former Lombard kingdom within the wider empire.
A Carolingian capitulary dated 781 is associated with Mantua, reflecting the use of royal ordinances (capitularies) as instruments for governance and oversight in Italy under Carolingian rule.
After Pepin’s death, Bernard (Pepin’s son) became king of Italy (commonly dated from 810), continuing Carolingian rule in the former Lombard kingdom but under increasingly contested terms within the imperial family.
King Pepin of Italy died on 8 July 810 at Milan, closing the first phase of Carolingian sub-kingship in Italy and triggering a succession that would culminate in renewed imperial supervision.
In July 817, Emperor Louis the Pious issued the Ordinatio Imperii, a succession settlement that placed Italy under Lothair’s superior authority—an arrangement that provoked conflict with King Bernard of Italy.
Following a rebellion against Louis the Pious, Bernard was condemned and blinded; he died on 17 April 818. His fall marked a decisive tightening of imperial control over Italy and the end of the 810–818 phase of Carolingian Italian kingship rooted in the Lombard conquest.
After Lombard pressure on papal territories intensified, Pope Hadrian I sought Frankish support, setting the stage for Charlemagne’s intervention in Italy and the subsequent conquest of the Lombard kingdom.
Frankish Conquest and Administration of the Lombard Kingdom (773–818)
