A co-cathedral is a cathedral church which shares the function of being a bishop's seat, or cathedra, with another cathedral, often in another city. Instances of this occurred in England before the Protestant Reformation in the dioceses of 'Bath and Wells', and of 'Coventry and Lichfield'. These two dioceses were each named for both cities that served as bishop's seats.
Parma Cathedral is a Roman Catholic cathedral in Parma, Emilia-Romagna (Italy), dedicated to the Assumption of the Blessed Virgin Mary. It is the episcopal seat of the Diocese of Parma. It is an important Italian Romanesque cathedral: the dome, in particular, is decorated by a highly influential illusionistic fresco by Renaissance painter Antonio da Correggio.
The Roman Catholic Metropolitan Archdiocese of L'Aquila is an ecclesiastical territory or diocese of the Roman Catholic Church in Italy. It was erected as the Diocese of L'Aquila on 20 February 1257 by Pope Alexander IV and promoted to an archdiocese by Pope Pius IX on 19 January 1876. Pope Paul VI elevated it to the rank of a metropolitan archdiocese on 15 August 1972, with the suffragan sees of Avezzano and Sulmona–Valva.
Adria Cathedral is a Roman Catholic cathedral in the city of Adria, in the province of Rovigo and the region of Veneto, Italy. Formerly the episcopal seat of the Diocese of Adria, it has been since 1986 that of the Diocese of Adria-Rovigo.
Amelia Cathedral is a Roman Catholic cathedral in Amelia in the province of Terni, Umbria, Italy. It was formerly the seat of the Bishop of Amelia, in existence from not later than the 5th century, but since 1983 has been a co-cathedral in the Diocese of Terni-Narni-Amelia.
Pescara Cathedral is a Roman Catholic cathedral in the Via D'Annunzio in the city of Pescara. The cathedral, dedicated to Saint Cetteus, patron saint of Pescara, has been the seat of the Archbishop of Pescara-Penne since the creation of the archdiocese in 1982. The present Romanesque Revival building, originally called the Tempio della Conciliazione, was constructed in the 1930s, replacing the medieval church of San Cetteo.
Acquapendente Cathedral is a Roman Catholic cathedral, dedicated to the Holy Sepulchre, in the town of Acquapendente in Lazio, Italy. Formerly the episcopal seat of the Diocese of Acquapendente, it is now a co-cathedral in the Diocese of Viterbo.
Montefiascone Cathedral or the Basilica of Santa Margherita is a former Roman Catholic cathedral in Montefiascone in the province of Viterbo, Italy, dedicated to Saint Margaret of Antioch, the patron saint of the town. It was formerly the episcopal seat of the Diocese of Montefiascone and is now a basilica minor.
Ragusa Cathedral is a Roman Catholic cathedral in Ragusa, Sicily, dedicated to Saint John the Baptist. The present church dates from the early 18th century. It has been the seat of the Bishops of Ragusa since the establishment of the diocese in 1950.
Lacedonia Cathedral is a Roman Catholic cathedral dedicated to the Assumption of the Virgin Mary in Lacedonia in Campania, Italy. Formerly the seat of the bishops of Lacedonia, since 1986 it has been a co-cathedral in the diocese of Ariano Irpino-Lacedonia.
Ascoli Piceno Cathedral is a Roman Catholic cathedral dedicated to Saint Emygdius in Ascoli Piceno, Marche, Italy. It is the episcopal seat of the Diocese of Ascoli Piceno.
Pescina Cathedral is a Roman Catholic cathedral in Pescina, Abruzzo, Italy, dedicated to the Blessed Virgin Mary under the title of "Saint Mary of the Graces".
Patti Cathedral is a Roman Catholic cathedral in Patti, Sicily, Italy, dedicated to Saint Bartholomew.
Messina Cathedral is a Roman Catholic cathedral located in Messina, Sicily. Formerly the episcopal seat of the Diocese of Messina, it became in 1986 the archiepiscopal seat of the Archdiocese of Messina-Lipari-Santa Lucia del Mela.
Pitigliano Cathedral is a Roman Catholic cathedral dedicated to Saints Peter and Paul in the town of Pitigliano, in the region of Tuscany, Italy.
Oria Cathedral is a Roman Catholic cathedral in Oria, province of Brindisi, Apulia, Italy, dedicated to the Assumption of the Virgin Mary. It is the episcopal seat of the Diocese of Oria.
Nola Cathedral is a Roman Catholic cathedral in Nola, a municipality within Naples in Campania, Italy, dedicated to the Assumption of the Virgin Mary. It is the episcopal seat of the Diocese of Nola. It was granted the status of a minor basilica in March 1954.
Corfinio Cathedral is a Roman Catholic cathedral in Corfinio, Abruzzo, Italy, dedicated to Saint Pelinus. It was formerly the episcopal seat of the Diocese of Valva and is now a co-cathedral in the Diocese of Sulmona-Valva.
Nardò Cathedral is a Roman Catholic cathedral in the town of Nardò, province of Lecce, region of Apulia, Italy, dedicated to the Assumption of the Virgin Mary. Formerly the seat of the bishops of Nardò, since 1986 it has been the episcopal seat of the diocese of Nardò-Gallipoli.
