The castle then passed into the hands of the Bishop of Sion, and played an important role in several wars during the second half of the 14th century.

[1][2] The site was located on the territory of the Bishop of Sion, and was ideal to oversee passages into the Upper Valais.

In an agreement of 1260 between Peter II of Savoy and Bishop Henri de Rarogne the frontier between their respective lands was established at the river Morge.

[3] He sought support from the Count Amédée VI of Savoy, but the latter seized the opportunity to invade Sion and retake the castle.

At the beginning of the 15th century, the Raron family had a major influence in the politics of the Valais, notably through the bishop of Sion, Wilhelm II.

[2] The ruins occupy the summit of the Mont d'Orge at an elevation of 782 m, 2 kilometers west of Sion allowing a splendid view of the whole valley.

The original access to the castle was located at its eastern side, which was protected on by a ditch dug in the rock and could be crossed by a drawbridge.

The west side of the castle was dominated by a round tower, probably about 15 meters high, which was also protected by a ditch.