Louis the Pious
Louis the Pious, also called Louis I, (778 - 840) was the third Carolingian King of Franks and 2nd Holy Roman Emperor (814 - 840), King of Aquitaine 781 to 814. He was Charlemagne's sixth son.
Louis The Pious Media
Louis's son Charles the Bald as depicted in the Vivian Bible, c. 845
Louis on a sesquisolidus, essentially Roman in design