Roman Catholic Diocese of Fidenza Tags: Clerical Administrative Region, Diocese.The Italian Catholic Diocese of Fidenza (Latin: Dioecesis Fidentina) in the Province of Parma was until 1927 the historical Diocese of Borgo San Donnino. It is a suffragan of the Archdiocese of Modena-Nonantola. thumbnail area (km2) 4.51e+08 country Italy Established 12 February 1601 ( years ago) province Roman Catholic Archdiocese of Modena-Nonantola Learn more... Loading...