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-sur-l'Océan Jean de Monts is also visible north of Sion. Many water activities can be practiced such as sailing, canoeing, surfing and kiting. Environment conducive to walking, riding, canoeing and cycling. Tourism is favorised by numerous food and housing accommodation. Sion neighborhood has made the town of Saint-Hilaire-de-Riez one of the most touristic cities of Vendée. Between sea, forest and dunes, Sion Ocean has kept its soul and charm of an authentic old fishing port. Every summer, the fireworks fired from the sea attracts thousands of people (50,000 in 2016). The creation of the Village of Sion is mainly the work