Prior to 1536, the state religion of Norway was Roman Catholicism, but the government of the Kingdom of Denmark-Norway joined in with the Protestant Reformation and in 1536 it declared itself to be Lutheran, and the Church of Norway was formed.
 In 1537, the diocese of Bjørgvin consisted of the (modern) counties of Hordaland and Sogn og Fjordane (with exception of the parishes of Eidfjord and Røldal).

The region of Sunnmøre (to the north) was transferred from the Diocese of Nidaros to the Diocese of Bjørgvin in 1622.
The parish of Eidfjord was transferred from the Diocese of Stavanger to Bjørgvin in 1630.
The parish of Røldal was transferred from the Diocese of Kristiansand to Bjørgvin in 1863.
The Sunnmøre region was removed from the Diocese of Bjørgvin in 1983 when it, along with the regions of Nordmøre and Romsdal (from the Diocese of Nidaros), were established as a separate diocese, the Diocese of Møre.
Prior to 1536, the state religion of Norway was Roman Catholicism, but the government of the Kingdom of Denmark-Norway joined in with the Protestant Reformation and in 1536 it declared itself to be Lutheran, and the Church of Norway was formed.  In 1537, the diocese of Bjørgvin consisted of the (modern) counties of Hordaland and Sogn og Fjordane (with exception of the parishes of Eidfjord and Røldal). 
The region of Sunnmøre (to the north) was transferred from the Diocese of Nidaros to the Diocese of Bjørgvin in 1622. The parish of Eidfjord was transferred from the Diocese of Stavanger to Bjørgvin in 1630. The parish of Røldal was transferred from the Diocese of Kristiansand to Bjørgvin in 1863. The Sunnmøre region was removed from the Diocese of Bjørgvin in 1983 when it, along with the regions of Nordmøre and Romsdal (from the Diocese of Nidaros), were established as a separate diocese, the Diocese of Møre.
Diocese of Bjørgvin