The Diocese of Tolentino was a Roman Catholic diocese in Italy from the fifth century until it was merged with the Diocese of Macerata-Tolentino in 1586.
Tolentino is a town and comune of about 20,000 inhabitants, in the province of Macerata in the Marche region of central Italy.
It is located in the middle of the valley of the Chienti.
Signs of the first inhabitants of this favorable and fertile coastal zone, between the mountains and the Adriatic, date to the lower Paleolithic.
Numerous tombs, from the 8th to the 4th centuries BCE, attest to the presence of the Piceni culture at the site of today's city, Roman Tolentinum, linked to Rome by the via Flaminia. Tolentinum was the seat of the diocese of Tolentino from the late 6th century, under the patronage of the local Saint Catervo. The urban commune is attested from 1099, assuming its mature communal form between 1170 and 1190, settling its boundaries through friction with neighboring communes like S. Severino and Camerino. From the end of the 14th century, the commune passed into the hands of the da Varano family and then the Sforza, before becoming part of the Papal States until the arrival of Napoleon.