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
Peeter Sion Christian saint who had chosen an ascetic life over a life of indulgence in Rome. The saint is often depicted in paintings in his study with a skull. Peeter Sion Peeter Sion or Peter Sion (c. 1620 – 21 August 1695) was a Flemish painter of landscapes, history paintings and genre scenes. His work was mainly produced for the export market and dealt with biblical stories. Little is known about the life of Peeter Sion. He is believed to have been born in Antwerp between 1615 and 1625. He was registered at the Guild of Saint Luke of Antwerp as