Tags: Clerical Administrative Region, Diocese.
The Roman Catholic Diocese of Koper (Latin: Dioecesis Iustinopolitanus; Slovene: Škofija Koper) is a diocese in southwestern Slovenia. It is part of the Ecclesiastical province of Ljubljana. Its cathedral is dedicated to the Assumption of Mary and is located in the Adriatic port town of Koper. A co-cathedral dedicated to Christ the Saviour is located in Nova Gorica; it gained its status in 2004.