On Christmas Day in the year 800, in St. Peter's basilica in Rome, Pope Leo III placed a crown on the head of a Frankish king named Charles — and, without quite meaning to, invented Europe. The coronation revived the idea of a Western empire three centuries after Rome's fall, and the continent has been arguing about its meaning ever since.
The empire in images
The rise
Charles — Charlemagne — had been king of the Franks since 768, and he spent three decades making the title real. He crushed the Lombards in Italy, ground down the Saxons in a thirty-year war, and smashed the Avars of the Danube basin, seizing a treasure so vast it took fifteen wagons to carry away. By 800 he ruled from the Pyrenees to the Elbe, and his power dwarfed the pope's — which is precisely why the pope crowned him.
The coronation was a transaction dressed as ceremony. Leo III needed a protector against Rome's aristocratic factions; Charles needed a legitimacy no mere kingship could supply. So the Frankish king became Imperator Romanorum, emperor of the Romans, in deliberate echo of ancient Rome. Charles reportedly disliked the surprise — but he kept the title, and with it came a new idea: Western Christendom as one political body under one anointed head.
The zenith
At its height, around 814, the empire was the largest Western polity since Rome, run with surprising sophistication. Charles divided it into counties under counts, watched by traveling inspectors — the missi dominici, the lord's envoys — who checked that local officials stayed honest and loyal. Oaths, roads, and the emperor's restless touring held it together: an early experiment in centralized government.
The court at Aachen also staged what historians call the Carolingian Renaissance. Scholars like Alcuin of York gathered manuscripts, founded schools, and standardized a clear new script — Carolingian minuscule — the ancestor of the lowercase letters you are reading now. Much of classical Latin literature survives only because Carolingian monks copied it in that clean hand before the originals rotted away.
The fall
The fatal flaw was Frankish succession custom: a father's lands divided among his sons. Charlemagne's heir Louis the Pious watched his own sons carve the empire into warring camps, and after years of civil war the three surviving grandsons met at Verdun in 843 and split the empire into three strips. That treaty sketched the outlines of France and Germany — and the middle kingdom became the corridor Europe would fight over for a thousand years.
Then came dissolution by a thousand cuts: Viking raids up the rivers, counts turning their counties into hereditary fiefs, emperors multiplying as they shrank. When Charles the Fat, the last ruler of the whole inheritance, was deposed in 887, the empire stopped pretending. By 888 it had broken into the kingdoms that became France, Germany, and Italy.
The legacy
Every European chancellery still lives with Verdun. The treaty drew the first draft of the Franco-German border, and each later attempt to unite Europe — Napoleon, then the EU, whose founders award a Charlemagne Prize for services to unity — has been, in a sense, an argument with 843.
The lowercase alphabet is the more democratic legacy: billions write daily in letters standardized by monks at Aachen. And the imperial idea — one Christian Europe under one crowned head — became the template the Holy Roman Empire, and later Europe's federalists, spent a millennium trying to rebuild.
Charlemagne remains the official father of both France and Germany — a shared paternity neither side will surrender. Eleven centuries on, the empire that invented Europe is still the continent's favorite family argument.