At a time when life across the continent is politically fragmented and chaotic one man has a vision of a European empire on a grand scale – and the charisma, skill and the drive to make it a reality. He will become known to history as Charlemagne, King of the Franks and Emperor of the Romans. Presenter David Adams crosses Europe to show how daring tactics, brilliant leadership and sheer force of numbers make Charlemagne and his army the most feared military power in 8th century Europe. Charlemagne wages over 50 campaigns during a 45-year reign and by 814, he commands a single Christian empire that spans more than a million square kilometres. However David reveals that the Emperor’s son and successor, Louis the Pious, is not the strong warrior king needed to hold the empire together. Eventually Louis’ own sons depose him and fight amongst themselves, each seeking a larger share of power and glory. The family feud climaxes in a fierce battle that leaves 40,000 dead and a treaty that divides Europe into three parts. It is the end of Charlemagne’s empire and sets the stage for 1,000 years of conflict.