Charlemagne crowns Louis the Pious
Louis the Pious, also called Louis I, (778 - 840) was the third Carollingian King of Franks and 2nd Holy Roman Emperor (814 - 840), King of Aquitaine 781 to 814. He was Charlemagne's sixth son.
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Louis the Pious doing penance at Attigny in 822
Louis on a sesquisolidus, essentially Roman in design.