Boniface de Challant

Boniface de Challant (c. 1240–1308) was a Valdostan cleric of the Challant family, appointed bishop of Sion by the pope in 1289 and consecrated in 1290. He ruled the see like a fief, building Tourbillon above Sion, and in 1293 demanded liege homage from Count Amadeus V of Savoy for Chillon.

From 1294 he warred on his neighbors, razing Riddes before making peace with Savoy in 1301. He founded the hospice of Brigue in 1304 and died at Sion in June 1308.