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, Netherlands Sion, Netherlands Sion is a hamlet in the Dutch municipality of Rijswijk. It is located on the border with Delft, and has a population of about 210. In 1345, the monastery "Sancta Maria in Monte Sion" was built in this area. It was demolished on the orders of the city of Delft in 1572, when Spanish troops approached the city, and was never rebuilt. In the 17th century, an estate was built on the grounds of the former monastery, and in the 19th century, it was divided into small parts and made into farms. There are now plans to build