Louis (c. 800 – 867), a Frankish churchman and a member of the Carolingian royal family, was the Abbot of Saint-Denis from 841.
Born around 800, Louis was the illegitimate son of Rotrude, daughter of Charlemagne, by Count Rorgon I of Maine.
[1] From 835, he served his uncle, the Emperor Louis the Pious, Charlemagne's successor, as archchancellor.
On Louis's death in June 840, he declared his allegiance to Charles the Bald and became his archchancellor.
On his death Charles named himself lay abbot and took direct control of the abbey.