[1][2] Camillo Acquacotta conjectures that it was around 578 that the first epoch of the diocese of Matelica came to an end, as a result of the massive destruction of the Lombard invasions.
The rights of the bishop and diocese of Camerino over the city and territory of Matelica were extinguished.
[4] In a decree of the Second Vatican Council, it was recommended that dioceses be reorganized to take into account modern developments.
The former cathedral in Matelica was to have the honorary title of co-cathedral, and its chapter was to be the Capitulum Concathedralis.
There was to be only one episcopal curia, one seminary, one ecclesiastical tribunal; and all the clergy were to be incardinated in the diocese of Fabriano-Matelica.