Aymon de Châtillon

Aymon de Châtillon (c. 1260–1323) was a Valdostan cleric of a cadet branch of the Challant lords. A canon of Aosta and Sion, he was elected bishop of Sion in 1308 after his cousin Boniface de Challant, becoming a prince of the Empire and count of the Valais.

In December 1308 he exchanged homages with the count of Savoy, and he defeated Bernese Oberland lords who had invaded the Upper Valais. He died at Sion on 19 July 1323.