The traces of this bishopric appear in the fourth century with St. Emidius, martyred under Diocletian, c. 303; and Claudius, who was allegedly present at the Synod of Rimini in 359, when the Arian heresy was rejected.

[5] On 11 March 2000, Pope John Paul II raised the bishopric of Pesaro to the rank of metropolitan archbishopric, and created the new ecclesiastical province of Picenum.

Ascoli, which had always been directly subject to the Holy See, was assigned to the province of Picenum and placed under the supervision of the archbishop of Pesaro.

Bonusjoannes then proceeded to Rome to obtain papal approval for his election from Pope Martin IV.

Orsini cited the persons concerned to appear in open court, and the issue was joined between Bonusjoannes and Abamons.

Finally, on 13 December 1285, new bulls were issued for the Bishop-elect, and Pope Honorius granted him the administration of his Church.

[14] A diocesan synod was an irregularly held, but important, meeting of the bishop of a diocese and his clergy.

Its purpose was (1) to proclaim generally the various decrees already issued by the bishop; (2) to discuss and ratify measures on which the bishop chose to consult with his clergy; (3) to publish statutes and decrees of the diocesan synod, of the provincial synod, and of the Holy See.

[18] Bishop Philippo Monti held a diocesan synod on 7—9 November 1677, and published its constitutions, as well as those of his predecessors Girolamo Berneri, Giulio Gabrielli, and Sigismondo Donati.