Roman Catholic Diocese of Sion Roman Catholic Diocese of Sion The Diocese of Sion (, , ) is a Roman Catholic ecclesiastical territory in the canton of Valais, Switzerland. It is the oldest bishopric in the country and one of the oldest north of the Alps. The history of the Bishops of Sion, of the Abbey of St. Maurice of Valais as a whole are inextricably intertwined. The see was established at Octodurum, now called Martigny, the capital of the Roman province of Alpes Poeninae. The first authentically historical bishop was Saint Theodore/Theodolus (died in 391), who was present at the Council of Aquileia in
Sion-sur-l'Océan and buildings of 70/80 years and we continue to build again. Popular for its panoramic view of the Bay of Sion is on this part of the city that house prices are highest. The area of the village is in full redesign with the development of a major infrastructure project on the scale of the town: thalassotherapy. Sion-sur-Ocean is facing the island of Yeu which more or less we see the coast on the horizon depending on the moisture in the air. The night of the two headlights of Yeu island are visible. The "skyline" of the town of Saint