Gainfroi, count of Sens

from Wikipedia

Arnulf of Sens(ca.793/794 - April, 841) was a Frankish noble, an illegitimate son of Louis the Pious, the son of Charlemagne. His mother Theodelinde of Sens (ca.764 - 794) was the daughter of Gainfroi, count of Sens and Theidlindis de Blois. He had one sister, Alpaïs de Paris, abbess of St-Pierre de Reims. In 794 A.D., Arnulf's mother Theodelinde of Sens was dead. In 817 Arnulf was appointed count of Sens in Burgundy. He was the first son of Louis the Pious, but he did not inherit land because he was illegitimate. In April 841 A.D., he died at Sens before the Treaty of Verdun.