The Coronation of Charlemagne

The papacy needs a protector

The immediate crisis comes from Rome. In 799, opponents of Leo III attack him during a procession, mistreat him, and prevent him from governing normally. The Annales regni Francorum report that the pope escapes by night and joins Charlemagne's envoys, before being conducted to the king at Paderborn.^[3]

Charlemagne therefore does not come to Rome as an isolated pilgrim. He comes as the effective protector of the Roman Church, heir to the alliance forged since Pepin the Short between the Carolingians and the papacy. The annals say that Leo III is received with the greatest honour at Paderborn, then escorted back to Rome; the following year, the king crosses the Alps to judge the case on the spot.^[4]

Constantinople looks weakened

The Byzantine context matters too. In 797, the empress Irene has her son Constantine VI deposed and blinded; she then reigns alone in Constantinople. Westerners do not simply consider that the Roman Empire has disappeared, but Eastern imperial authority appears politically weakened. Britannica sums up the Western perception of 799: Alcuin regarded the imperial throne as vacant.^[5] No letter of Alcuin's quoted here says so in so many words: it is a historian's reading of the context — plausible, but not a quotation from Alcuin.

It would be too simple to say that Charlemagne is crowned only because a woman reigns in Constantinople. The causes are broader: Leo III's safety, Frankish military power, Roman prestige, the Carolingian Christian reform, and the Frankish king's long-standing role as protector of St Peter. But the Byzantine crisis removes a major symbolic obstacle: it makes the restoration of an imperial title in the West more conceivable.

The Frankish king already governs as a head of Christendom

Since 774, Charlemagne has been king of the Lombards; for decades he has fought the Saxons, organised the frontiers, supported monasteries, corrected liturgical texts, and promoted a moral reform of clergy and people. The imperial title thus crowns an already immense political reality: a Frankish kingdom become a European power.

The key is not to read the event backwards. The coronation is not the beginning of Charlemagne's greatness; it is its solemn recognition in a Roman idiom. Frankish power exists before the crown. The crown gives it a new form — more universal, more Roman, more directly tied to the defence of the Church.

The inquiry into Leo III precedes the ceremony

Charlemagne arrives in Rome at the end of November 800. The annals describe the welcome organised by Leo III, the clergy and the Roman people, then the solemn entry into St Peter's Basilica.^[6] The king then publicly states the reason for his coming: to deal with the accusations brought against the pope.

On 23 December 800, Leo III ascends the ambo of St Peter's — the raised stone tribune from which the Gospel is proclaimed — holds the Gospel in his hand and clears himself by oath of the accusations brought against him, since no accuser is willing to prove them.^[7] Two days later, the coronation takes place. The closeness of the dates is essential: the imperial title emerges in a concrete judicial and ecclesial context, not in an abstract propaganda ceremony.

Christmas 800 : the crown, the acclamation, the title

The testimony of the Annales regni Francorum is the most precise on the proceedings:

"To Charles Augustus, crowned by God, great and peaceful emperor of the Romans, life and victory !" — Roman acclamation, 25 December 800^[8]

The formula condenses the whole issue. Charles is not merely hailed as king of the Franks; he receives a Roman title. He is not merely recognised by an assembly of Frankish magnates; he is acclaimed in the basilica of St Peter. He is not merely honoured by the pope; the Roman people take part in the act through public praise.

Three words need explaining. "Augustus" is the imperial name par excellence, inherited from the first Roman emperor: to bear it is to call oneself emperor. The "acclamation" is the solemn cry by which the Roman people, gathered in the basilica, take part in the ritual and ratify the new title. The "titulature" refers to the full set of official titles now attached to Charles: king of the Franks and Lombards, emperor and Augustus.

The place matters as much as the gesture. Recent liturgical research stresses that the ceremony very probably took place within the main Christmas Day Mass in the old St Peter's Basilica. The major sources agree on the date of 25 December, and the Frankish annals use the formula ad missam, which J. F. Romano translates and defends as "at Mass".^[9]

Was Charlemagne taken by surprise ?

Einhard, Charlemagne's biographer, gives a famous version: Charles reportedly felt such aversion to the titles of emperor and Augustus that he declared he would not have entered the church that day had he known the pope's design.^[10]

"He would not have set foot in the church that day, though it was a great feast, if he could have known the pontiff's design." — Einhard, Life of Charlemagne, ch. 28^[11]

This sentence must not be naively taken as proof of total improvisation. Modern historians stress that the king, the pope and the Frankish entourage had strongly convergent interests. Britannica considers that the sum of the evidence makes collaboration between Charles and Leo III to prepare the change of title very probable, even if the exact form of the ceremony may have left the visible initiative to the pope.^[12]

A Roman restoration — but a Western one

The imperial title of 800 does not mean that Charlemagne becomes the Byzantine emperor, nor that he absorbs Constantinople. It means that in the West, around Rome, a Christian power claims Roman continuity. Carolingian titulature will hesitate, moreover: Charles keeps his titles of king of the Franks and Lombards, and uses a formula such as "emperor governing the Roman Empire".^[13]

The distinction is crucial: the coronation does not resurrect the ancient Roman Empire in its administrative form. It gives the Frankish king a Christian imperial dignity, useful for governing a collection of peoples, protecting Rome, judging the pope's enemies, and presenting the Carolingian reform as a task of Christendom.

An act with a double reading : papal and Frankish

The act can be read in two ways. From the pontifical point of view, Leo III bestows the crown: the pope appears as the one who transfers or confers imperial dignity. This reading will later nourish strong theories of pontifical superiority over the empire.

From the Frankish point of view, Charlemagne is already the protector of Rome, the political master of Carolingian Italy, and the effective head of the Latin West. The crown recognises an existing power rather than creating it. What follows shows this: in 813, Charlemagne will associate his son Louis with the empire at Aachen, with no pope present — as if to limit the idea that Rome is always necessary for the transmission of imperial authority.^[14]

Byzantine recognition remains limited

Constantinople does not resign itself immediately. Einhard reports that the Eastern emperors suspect Charles of wanting to wrest the empire from them, but that they also seek alliance.^[15] After tensions and negotiations, Emperor Michael I recognises Charlemagne's imperial title in 812, but in a limited way: Charles is recognised as emperor, not as "emperor of the Romans" in the exclusive sense that Constantinople reserves for itself.^[16]

This compromise explains a long ambiguity. The Latin West speaks of a restored empire; Byzantium maintains that it remains the true Roman continuity. The coronation of 800 thus opens less a recovered unity than a lasting rivalry between two ways of calling oneself Roman.

A strengthened alliance between Rome and the Franks

The first effect is the intensification of the bond between the papacy and the Carolingian dynasty. Rome gains a protector more powerful than the local aristocratic families and closer than Constantinople. The Franks receive in return a sacred, Roman, universal prestige.

This alliance is not without danger. If the emperor protects the Church, he may also want to organise its affairs. If the pope crowns the emperor, he may also claim a decisive role in political legitimacy. The Latin Middle Ages will inherit this tension: necessary cooperation, possible rivalry, future quarrels over investiture and the superiority of powers.

The Carolingian reform gains an imperial horizon

The imperial title gives new scope to the reform programme. After 800, Charlemagne and his counsellors insist on the correction of morals, liturgical unity, the formation of the clergy, the copying of texts, monastic discipline, and Christian public order. The empire becomes a moral framework: to govern is to lead a Christian people towards a life more conformed to the faith.

The palatine chapel at Aachen, begun towards the end of the 8th century, symbolises this ambition. It is not the place of the 800 coronation, but it becomes the monumental heart of Carolingian power: a space of prayer, court life, imperial memory, and Roman continuity reinterpreted north of the Alps.

A founding event — but not a mythical one

The coronation of Charlemagne is foundational because it gives the Latin West a lasting Christian imperial figure. But it must not be turned into a simple myth. It founds neither the papacy, nor the Church, nor Europe in the modern sense. It is born of a precise Roman crisis, an already established Frankish power, a complicated Byzantine diplomacy, and a political theology in which the protection of the Church and the prince's authority are closely intertwined.

The event can thus be summed up in a formula: on 25 December 800, Rome does not create Charlemagne, but gives him a title capable of politically expressing what he had already become — the most powerful head of Latin Christendom.

• The Baptism of Clovis — the entry of the Franks into Nicene Catholicism.
• The Quarrel over Images — the Byzantine context and the gradual estrangement between Rome and Constantinople.
• Second Council of Nicaea — the council of 787, received with difficulty in the Carolingian West.
• The Carolingian Reform — the religious and cultural programme carried by Frankish power.
• The Photian Schism — a later stage of tensions between Rome and Constantinople.