Conrad I, Count of Auxerre

Conrad I the Elder (died about 864) was the count of several counties, most notably the Aargau and Auxerre, around Lake Constance, as well as Paris from 859 to 862/4. He was also the lay abbot of Saint-Germaine in Auxerre. Conrad's father was Welf. He was one of the early Welfs, a member of the Bavarian branch, and his sister Judith was the second wife of Louis the Pious.

Between 834 and 838, Conrad married Adelaide of Tours, daughter of Hugh of Tours. They had:

• Hugh
• Conrad the Younger
• Probably his son was also Welf I count of Alpgau and Linzgau in Swabia

In 858, he and his family, abandoned their sovereign Louis the German and went over to Charles the Bald, Judith's son. They were generously rewarded and Conrad was appointed to many countships. Louis the German confiscated his Bavarian fiefs and lands.

The Miracula Sancti Germani calls Conrad Chuonradus princeps (prince, sovereign), when recording his marriage. By some accounts his wife re-married to Robert the Strong after his death.

• Heidecker, Karl Josef (2010). The Divorce of Lothar II: Christian Marriage and Political Power in the Carolingian World. Translated by Guest, Tanis M. Cornell University Press.199
• Nelson, Janet L. (1996). Frankish World, 750-900. Hambledon Press.
• Reuter, Timothy, ed. (1992). The Annals of Fulda. Volume II. Manchester University Press.