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 Abbey (Netherlands) founded New Sion Abbey on the island of Schiermonnikoog. Sion Abbey (Netherlands) Sion Abbey () is an operational Trappist monastery in Diepenveen, Overijssel, Netherlands, in the Diocese of Utrecht. The monastery, which was set up in 1883, is a daughter house of Achel Abbey. This is the only Trappist community in the Netherlands north of the great rivers (i.e., the Nederrijn, the Lek, the Waal, the Merwede and the Maas). Since 1935 the monastery has had the status of an abbey. Most of the complex is in Neo-Gothic style and was designed by architect Gerard te Riele. In 2015, the