The Catholic Diocese of Bergen or Diocese of Bjørgvin in Norway existed from the eleventh century to the Protestant Reformation (1537),[1][2] and included the (modern) counties of Hordaland and Sogn og Fjordane (with exception of the parishes Eidfjord and Røldal).
Originally (from 1068) the diocese served all the area of Gulating: the modern counties of Hordaland, Sogn og Fjordane, Rogaland, Vest-Agder and Aust-Agder - and the regions of Sunnmøre, Valdres and Hallingdal.
When the Diocese of Stavanger was established, around 1125, the counties of Rogaland, Aust-Agder and Vest-Agder were transferred to the new diocese - together with the regions of Valdres and Hallingdal (and the parishes of Eidfjord and Røldal from Hordaland).
The region Sunnmøre was transferred to the Archdiocese of Nidaros some time after 1152 - to secure more income for the Archdiocese.