John I, Count of Auxerre

John I of Chalon (c. 1243–1309), lord of Rochefort in the county of Burgundy, became count of Auxerre through his marriage to its heiress Alix of Burgundy, confirmed by a Parlement of Paris ruling in 1273. In 1293 he also took the title of count of Tonnerre.

From 1294 to 1301 he led Comtois barons resisting Philip IV, who had bought the county from Otto IV. After his son William fell at Mons-en-Pévèle in 1304, William's widow guarded their son John II until her remarriage in 1308; John I then guarded his grandson until his own death in October 1309.