Arnulf of Sens (c.794 – April, 841) was a Frankish noble, an illegitimate son of Louis the Pious,[1] son of Charlemagne. He had one sister, Alpaïs,[1] abbess of Saint-Pierre-les-Dames, Reims.
Arnulf's grandfather, Charlemagne, died in 814 with his father Louis becoming emperor. Three years later in 817, Arnulf, was appointed count of Sens in Burgundy.[2] He was the first son of Louis the Pious, but he did not inherit land because his birth was illegitimate. In April 841, a year after his father had died, he died at Sens.