Tags: Clerical Administrative Region, Diocese.
The Roman Catholic Diocese of Peterborough (Latin: Dioecesis Peterboroughensis) is a Roman Catholic diocese that includes part of the Province of Ontario. It was first established July 11 1882 by Pope Leo XIII and was found through the union of the Vicariate of Northern Canada and the western part of the Diocese of Kingston. As an Episcopal see it extended from the shores of Lake Ontario north to Georgian Bay and from the shores of Lake Superior to the border of the Archdiocese of St.