Charlemagne created the largest empire in western Europe since the Romans. But it didn’t last. Within only a few decades of his death, it had broken up and one half of it was fighting for its survival against a new and terrifying enemy from the north: the Vikings. In this episode, I want to ask why did that happen? 

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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.