Roman Catholic Diocese of Piacenza–Bobbio

The Italian Catholic Diocese of Piacenza-Bobbio has existed since 1989. In northern Italy, it is a suffragan of the Archdiocese of Modena-Nonantola. The historic Diocese of Piacenza was combined with the territory of the diocese of Bobbio-San Colombano, which was briefly united with the archdiocese of Genoa.

Piacenza was originally a suffragan of Milan. Bishop Majorianus was one of the bishops who attended the synod of Milan called by Archbishop Eusebius in 451. Piacenza was certainly suffragan to Ravenna by the time of the Roman synod of 680.On 21 October 1106, Pope Paschal II, at the Council of Guastalla, removed the dioceses of Emilia from the metropolitanate of Ravenna, and made them directly dependent upon the Holy See.