The Italian Roman Catholic diocese of Bobbio was an Italian bishopric which existed from 1014 until 1986, having been created from Bobbio Abbey until 1923.
In the year 1014, the Emperor Henry II, on the occasion of his own coronation in Rome, obtained from Pope Benedict VIII the erection of Bobbio as an episcopal see. Peter Aldus, its first bishop, had been Abbot of Bobbio since 999, and his episcopal successors for a long time lived in the abbey, where many of them had been monks. According to Ferdinando Ughelli and others, Bobbio was made a suffragan see of the Metropolitan Archdiocese of Genoa in 1133; but Fedele Savio finds this subordination mentioned for the first time in a Bull of Pope Alexander III, dated 19 April 1161. From time to time disputes arose between the bishop and the monks, and in 1199 Pope Innocent III issued two Bulls, restoring the abbey in spirituals and temporals, and empowering the bishop to depose an abbot if within a certain time he did not obey.
In 1923 it was united with the Territorial Abbey of San Colombano, at Bobbio, from which it originated, with the combined official name diocese of Bobbio-San Colombano. As reorganised in 1986, it became part of the Metropolitan Archdiocese of Genova-Bobbio.
In a subsequent change, Bobbio Abbey's 'united title' was transferred, in 1989, to the Metropolitan Diocese of Piacenza-Bobbio.
Blessed Albert (1184), who was translated to the Latin Patriarchate of Jerusalem's see and died a martyr at Acre in 1214;
the canonist Giovanni de Mondani (1477–82);
Saint Antonio Maria Gianelli (1838–46).
Erected: 11th Century
Latin Name: Bobiensis
Metropolitan: Archdiocese of Genoa
Alessio di Siregno, O.F.M. (1405–1409 Appointed, Bishop of Gap)
Daniele Pagani (bishop) (1418–1447 Died)
Marliano Baccarini (1447–1463 Died)
Stefano Ghillini, O.P. (1465–1472 Died)
Giovanni de Mondani (1472–1482 Died)
Lucchino Trotti (1482–1494 Died)
Bernardino Ilcino, O.S.A. (1495–1500 Died)
Juan Bautista Bagaroto (1500–1519 Died)
Agostino Trivulzio (1522–1524 Resigned)
Ambrogio Trivulzio (1524–1546 Died)
Borso Merli (1546–1560 Resigned)
Sebastiano Donati (1560–1561 Died)
Francesco Abbondio Castiglioni (1562–1568 Died)
Eugenio Camuzzi (1568–1602 Died)
Camillo Olario (Aulari, Ozario) (1602–1607 Died)
Marco Antonio Bellini (1607–1618 Died)
Francesco Maria Abbiati, C.R.L. (1618–1650 Died)
Alessandro Porro, C.R. (1650–1660 Died)
Bartolomeo Capra (1661–1693 Died)
Carlo Giuseppe Morozzo, O. Cist. (1693–1698 Appointed, Bishop of Saluzzo)
Ambrogio Croce, O.S.B. (1698–1713 Died)
Carlo Francesco Gallarini (1714–1716 Died)
Idelfonso Manara, B. (1716–1726 Died)
Carlo Cornaccioli, O. Carm. (1726–1737 Died)
Giuseppe Luigi de Andujar, O.P. (1737–1743 Appointed, Bishop of Tortona)
Bernardino Campi (1743–1746 Died)
Gaspare Lancellotti-Birago (1746–1765 Died)
Ludovico Terin Bonesio, O.F.M. Cap. (1766–1780 Died)
Carlo Nicola Maria Fabi Borsella, O.E.S.A. (1781–1803 Died)
Isaia Volpe (Volpi), O.F.M. Cap. (1818–1830 Died)
Giovanni Giuseppe Antonio Cavalleri, O.F.M. Cap. (1832–1836 Died)
St. Antonio Maria Gianelli (1838–1846 Died)
Pier Giuseppe Vaggi, O.F.M. Cap. (1849-1869 Died)
Enrico Gajo, O.F.M. Cap. (1872–1880 Died)
Giovanni Battista Porrati (1880–1902 Died)
Pasquale Morganti, O.Ss.C.A. (1902–1904 Appointed, Archbishop of Ravenna)
Carlo Castelli, Obl.S.C. (1904–1906 Appointed, Archbishop of Fermo)
Luigi Maria Marelli (1907–1915 Appointed, Bishop of Bergamo)
Pietro Calchi Novati (1914–1927 Appointed, Bishop of Lodi)
United: 4 August 1923 with the Territorial Abbey of San Colombano
Metropolitan: Archdiocese of Genoa
Matteo Pellegrino (1928–1936 Died)
Bernardo Bertoglio (1937–1953 Died)
Pietro Zuccarino (1953–1973 Died)
