In March 1361, after nine years as bailiff, Amédée VI signed the Treaty of Evian and gave up interfering in the affairs of the bishop of Sion. In 1375, Guichard Tavelli was assassinated by supporters of Antoine de la Tour, son of Pierre, which led the Valaisans to ally themselves with Peter of Raron, a member of a powerful family from the Upper Valais who was a rival of the de la Tour family. After having beaten Antoine de la Tour, the Valaisans, pushed by Peter of Raron, rose several times against the successor of Tavelli, Édouard de Savoie-Achaïe. In 1384, the Valaisans took over the Tourbillon, Majorie and Soie castles. Amedeus VII, a relative of Édouard de Savoie, laid siege to Sion and partially destroyed the town. Once the revolt had been brought under control, he imposed a severe peace treaty on the rebels allowing the bishop to recover his castles. This did not prevent the bishop from leaving his post two years later, and it was not until 1392 that a unanimous candidate was found by the diocese of Sion. Between the resignation of Édouard de Savoie-Achaïe and the election of the new bishop, the Count of Savoy made men available to guard the castle. As conflicts between the diocese and the people were still going on, the members of the diocese did not dare to show themselves in public, and they had to pay a chaplain to say mass in the Tourbillon chapel.