Roman Catholic Diocese of Novo Mesto Tags: Clerical Administrative Region, Diocese.The Roman Catholic Diocese of Novo Mesto (Latin: Dioecesis Novae Urbis; Slovene: Škofija Novo mesto) is a diocese located in the city of Novo Mesto in the Ecclesiastical province of Ljubljana in Slovenia. thumbnail point area (km2) 2.16e+09 country Slovenia Established 7 April 2006 jurisdiction Diocese province Roman Catholic Archdiocese of Ljubljana latitude 45.8035 longitude 15.1669 Learn more... Loading...