 It comprises the Cantons of Fribourg, Geneva, Vaud and Neuchâtel, with the exception of certain parishes of the right bank of the Rhône belonging to the Diocese of Sion (Sitten).It was created by the merger in 1821 of the Diocese of Lausanne and the Diocese of Geneva, both prince-bishoprics until they were secularized during the Reformation.Until 1924, it was called the Diocese of Lausanne and Geneva.