Claudiopolis (Greek: Κλαυδιόπολις) was an ancient city in the Roman province of Paphlagonia (and later Honorias) in northern Asia Minor.
As secular capital of the Roman province of Honorias, in the civil Diocese of Pontus, the bishopric of Claudiopolis became the metropolitan see, in the sway of the Patriarchate of Constantinople, with five suffragan sees : Heraclea Pontica, Prusias ad Hypium, Tium, Cratia and Hadrianopolis in Honoriade.
It appears as such in the Notitiae Episcopatuum of Pseudo-Epiphanius of about 640 and in that of Byzantine Emperor Leo VI the Wise of the early 10th century, ranking sixteenth viz.
Under Ottoman rule since the 14th century it lost to Heraclea Pontica the Metropolitan dignity.
Michel Le Quien mentions twenty bishops of the see to the 13th century; documentary mentions are available for the following incumbent bishops and archbishops: The archdiocese was nominally restored by the Catholic Church as a Latin Metropolitan titular archbishopric no later than the seventeenth century, first named Claudiopolis (Latin) / Claudiopoli (Curiate Italian), renamed in 1933 as Claudiopolis in Honoriade (Latin) / Claudiopoli di Onoriade (Italiano) / Claudiopolitanus in Honoriade (Latin).