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The Diocese of Norcia was a Latin Church diocese of the Catholic Church which existed twice (c490-1000 and 1821-1986). Both times, the episcopal see was in Norcia in the modern Perugia Province, Umbria region of central Italy.

• Established in 490 as Diocese of Norcia / Nursin(us) (Latin) without explicit precursor.
• Suppressed circa 1000?, its territory being merged into the then Diocese of Spoleto.
• Restored on 1821.09.15 as Diocese of Norcia / Nursin(us) (Latin), on territory split off again from the meanwhile promoted exempt Archdiocese of Spoleto.
• Lost territory on 1984.03.19 to the Archdiocese of Camerino.
• Suppressed on 1986.09.30, its territory and title being merged into the thus renamed Roman Catholic Archdiocese of Spoleto-Norcia.

• Its former Cathedral became Spoleto-Norcia's Co-Cathedral: Concattedrale di S. Maria Argentea, in Norcia, but was destroyed by an earthquake on 2016.10.30.
• Furthermore it left a Minor Basilica, dedicated to Saint Benedict : Basilica di S. Benedetto, Norcia

no incumbents from the first millennium known

Suffragan Bishops of Norcia (restored)

• Gaetano Bonanni (1821.06.27 – 1843)
• Letterio Turchi (1843.04.03 – 1850.05.20), next Bishop of Città di Castello (Italy) (1850.05.20 – death 1861.11.08)
• Raffaele Bacchettoni (1850.05.20 – retired 1880.11.27?); emeritate as Titular Bishop of Myrina (1880.12.13 – death 1881)
• Domenico Bucchi-Accica (1880.12.13 – 1889.12.30), previously Titular Bishop of Lystra (1873.12.22 – 1880.12.13), later Bishop of Orvieto (Italy) (1889.12.30 – 1905)
• Mariano Cavasci, Capuchin Friars Minor (O.F.M. Cap.) (1890.06.23 – retired 1895.03.18); emeritate as Titular Archbishop of Scythopolis (1895.03.18 – death 1899.02.09)
• Nicola Ranieri, O.F.M. (1895.03.18 – death 1905)
• Ercolano Marini (1905.12.11 – 1915.06.02); previously Titular Bishop of Archelaïs (1904.06.29 – 1905.12.11) as Auxiliary Bishop of Spoleto (Italy) (1904.06.29 – 1905.12.11); later Archbishop of Amalfi (Italy) (1915.06.02 – retired 1945.10.27), emeritate as first Titular Archbishop of Aprus (1945.10.03 – 1945.10.27), then Titular Archbishop of Adana (1945.10.27 – death 1950.11.16)
• Vincenzo Migliorelli (1916.07.11 – 1927.08.10); later Bishop of Treia (Italy) (1927.08.10 – 1930.02.27), Bishop of San Severino (Italy) (1927.08.10 – retired 1930.02.27), emeritate as Titular Bishop of Samos (1930.02.27 – death 1939.02.24)
• Settimio Peroni (1928.12.17 – retired 1951.02.01); emeritate as Titular Archbishop of Viminacium (1951.02.01 – death 1958.10.12)
• Ilario Roatta (1951.03.27 – 1960.03.08); next Bishop of Sant’Agata de’ Goti (Italy) (1960.03.08 – retired 1982.01.02), died 1991
• Alberto Scola (1960.03.28 – retired 1972.05.13), died 1982
• Giuliano Agresti (1972.05.13 – 1973.03.25); also Archbishop of Spoleto (Italy) (1969.11.07 – 1973.03.25); later Archbishop of Lucca (Italy) (1973.03.25 – 1990.09.18)
• Ottorino Pietro Alberti (1973.08.09 – 1986.09.30), also last Archbishop of Spoleto (Italy) (1973.08.09 – 1986.09.30), restyled first Archbishop of successor see Spoleto–Norcia (1986.09.30 – 1987.11.23); later Metropolitan Archbishop of Cagliari (Sardinia, Italy) (1987.11.23 – retired 2003.06.20), died 2012.

• List of Catholic dioceses in Italy

• GCatholic with Google satellite photo - data for all sections
• with Google satellite photo/map - former cathedral

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