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 Mills in July 1969. Sion Mills Cricket Club plays in the North West Senior League. The River Mourne was the reason that Herdman's Mill was built in Sion Mills, County Tyrone. It was founded in 1835 and is a large complex of now listed buildings, the most prominent of which was built in 1853 by William Henry Lynn of Lanyon, Lynn and Lanyon, Belfast. This is a very large and handsome five-storey mill built in Italianate style of grey ashlar stone quarried locally, with yellow brick extensions added in 1884 to 1900. There had been a series of corn mills on