The final political legacy of the Roman Empire in western Europe was the Holy Roman Empire. 

Amazingly, this curious political institution lasted until Napoleon abolished it in 1806. In the eighteenth century, the French political philosopher Voltaire famously described it as neither Holy nor Roman nor an Empire. He may have been right in his own age, but it was originally born with the dream of restoring Charlemagne's empire, itself a restoration of the once mighty Roman Empire. It was a dream that would last a thousand years.

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Find my latest book, Justinian's Empire, on Amazon.com and Amazon.co.uk. For German listeners, find the German translation of the first book in my series on the 'Fall of the Roman Empire', Die römische Revolution, on Amazon.de. Finally check out my new YouTube videos on the fall of the Roman Empire.