Soie Castle was built around 1200 by Landri de Mont, the Bishop of Sion, possibly to restrict the power of the Counts of Savoy in Valais.

[1] By the mid 14th century Bishop Guichard Tavel had moved from the old fortress of Tourbillon to Soie.

On 8 August 1375 Antoine de la Tour and his soldiers entered the castle looking for the Bishop.

They found him reading his breviary in the garden and seizing him, dragged the Bishop to the top of the walls before hurling him off to the rocks below.

Almost ten years later, in 1384, Count Amadeus VII finally recaptured the castle and reinstalled the bishop in his office.