Category:Dioceses established in the 1st century

• Early Christianity

A

• Acrassus
• Roman Catholic Archdiocese of Agrigento
• Apollonos Hieron
• Patriarchate of Aquileia

B

• Roman Catholic Archdiocese of Benevento
• Roman Catholic Diocese of Brescia

C

• Roman Catholic Diocese of Cartagena
• Roman Catholic Archdiocese of Catania
• Cerasa
• Roman Catholic Diocese of Cesena-Sarsina

D

• Derbe (Diocese)

E

• Ecumenical Patriarchate of Constantinople
• El-Kentour

F

• Roman Catholic Diocese of Fano-Fossombrone-Cagli-Pergola
• Roman Catholic Diocese of Fiesole
• Roman Catholic Archdiocese of Florence
• Roman Catholic Diocese of Foligno

G

• Gordus (Lydia)
• Roman Catholic Diocese of Guadix

H

• Hermocapelia
• Hyrcanis (Lydia)

J

• Patriarchate of Jerusalem

L

• Roman Catholic Diocese of Latina-Terracina-Sezze-Priverno

M

• Mesotymolus
• Metropolis of Corinth
• Metropolis of Ephesus
• Metropolis of Iconium
• Metropolis of Pergamon
• Metropolis of Thebes and Livadeia
• Roman Catholic Archdiocese of Milan
• Mostene
• Mother See of Holy Etchmiadzin

N

• Roman Catholic Archdiocese of Naples
• Roman Catholic Diocese of Naples

P

• Roman Catholic Archdiocese of Palermo
• Patriarch of Alexandria
• Patriarch of Antioch
• Metropolis of Philadelphia
• Roman Catholic Diocese of Pozzuoli

R

• Roman Catholic Archdiocese of Ravenna-Cervia
• Roman Catholic Archdiocese of Reggio Calabria-Bova
• Roman Catholic Diocese of Reggio Emilia–Guastalla
• Roman Catholic Archdiocese of Malta
• Diocese of Rome

S

• Sala (Lydia)
• Satala in Lydia
• Metropolis of Smyrna
• Roman Catholic Archdiocese of Spoleto-Norcia

T

• Tabala (Lydia)
• Tracula