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
Order of Sion a hoax perpetrated in the 1960s in France. Order of Sion The Order of Sion was a mediaeval order of canons which, according to a papal bull of the 12th century, had abbeys on Mount Sion in Jerusalem, on Mount Carmel, in Southern Italy (Calabria), and in France. The Order occupied its "mother" abbey, the Abbey de Notre Dame du Mont Sion, built on the foundations of the original apostolic Cenacle, or Coenaculum, traditionally assumed to be the location of the Last Supper. The abbey was maintained up until c1291, when it fell to the Muslims. Supposed connections with the