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 Hill also contains a brick tenant house, "circa" 1790, with two rooms on each of two levels. The house originally featured formal gardens, now largely lost. The property preserves expansive views of Chesapeake Bay and the town of Havre de Grace. The house was listed for sale on 9/11/2018 for 1.2 million dollars. Sion Hill Sion Hill is a National Historic Landmark in Havre de Grace, Maryland, notable as an example of high-style Federal architecture and as the home of a family of prominent officers of the United States Navy. Work began at Sion Hill around 1785 for the Rev. John