Otto I's coronation in St. Peter's Basilica reestablished a Western imperial title that had lapsed since the Carolingian line withered, forging an alliance between German kingship and the papacy that would define European politics for centuries. The Holy Roman Empire he founded persisted, in one form or another, until Napoleon dissolved it in 1806.
Otto had already spent over a decade consolidating power east of the Rhine, crushing rebellious dukes and defeating the Magyars, before he marched into Italy at the invitation of a beleaguered Pope John XII, who needed protection from rival Italian nobles. The price of that protection was the imperial crown.
The ceremony deliberately echoed Charlemagne's coronation by Pope Leo III in 800, a calculated act of political theater meant to cast Otto as heir to a lost Roman-Christian order. John XII, only in his mid-twenties and more interested in his own survival than ideology, soon regretted the bargain: Otto forced him to swear loyalty and later had him deposed for treachery.
The title 'Holy Roman Emperor' bound German kings to Italian entanglements for the next 800 years, a mixed inheritance that gave them prestige but dragged them into endless wars over papal politics. Voltaire's later quip that the empire was 'neither holy, nor Roman, nor an empire' has some truth, but its origin on this day was a genuine, ambitious fusion of Germanic military power and Roman ecclesiastical authority.
Key people: Otto I, Pope John XII