The name Laurentius often appears as the earliest known bishop of Bojano, and a participant in the third Roman synod of Pope Symmachus (498–514) in 501.

[1] It has been pointed out, however, that the manuscripts have variants: Bovianensis, Bobianensis, Boensis, Bonensis, Bononiensis, Bonomensis, Vovianensis, Vohianensis, Vivianensis.

[7] On 24 January 1058, Pope Stephen IX confirmed the privileges and rights of Udalricus, Archbishop of Benevento, including the church of Boiano.

[9] The first bishop of Boiano known by name is Adalberto (Alberto), who participated in the consecration of the major church at Montecassino by Pope Alexander II, on 1 October 1071.

[13] In 1239, Frederick designated certain strategic castles as "castra exempta", which were to be administered directly by the "provisores castrorum."

[15] Others were: Giovanni (1226), who decorated the facade at his own expense, as recorded in an inscription; Silvio Pandoni (1489), who restored the work of Giovanni; Cardinal Franciotto Orsini (1519) and Bishop Carlo Carafa (1572), who adorned the cathedral with costly furnishings; and Celestino Bruni (1653), theologian and preacher.

On 21 August 1976, he issued the decree "Ad apicem", creating the new ecclesiastical province entitled «Boianensis-Campobassensis», with its administrative center in Campobasso.

[24] On 21 January 1983, Pope John Paul II issued the decree "Ad Uberius", by which he removed the towns of Sant'Angelo Limosano, Limosano, Matrice, Campolieto, Monacilioni, San Giovanni in Galdo, Toro, Campodipietra, Jelsi, Gildone, Gercemaggiore, Riccia, Gambatesa, Tufara, Pietracatella, Macchia Valfortore, S. Elia a Pianisi, from the ecclesiastical jurisdiction of the archbishop of Benevento and assigned them to the jurisdiction of the archbishop of Campobasso-Boiano.