[2][3] Under Diocletian, according to the local legend, 4000 Christians with their bishop, whose name is unknown, were burned alive in their church.

[9] In a separate document of 26 January 1252, Pope Innocent ordered Bishop Bongiovanni Fissiraga to confiscate all the benefices and fiefs of clergy and laity who had supported the Emperor Frederick II.

(1289–1296) took part in the provincial synod held on 27 November 1271, by Archbishop Otto Visconti of Milan, for the purpose of aid to the Holy Land.

[13] Bishop Aegidius dall' Aqua (1307–1312) was represented by the Archpriest Pagazani at the provincial synod of Milan, held at Bergamo on 5 July 1311, under the presidency of Archbishop Castano Turriano.

[25] The fourteenth diocesan synod, embracing themes of evangelization advocated by Pope Francis, took place, after more than ten years' preparation, in January 2020, under the leadership of Bishop Maurizio Malvestiti.

[27] The cathedral was completed, except for the façade, in 1163, and the remains of Bishop Bassianus reburied in the crypt, in the presence of Antipope Victor IV and the Emperor Frederick Barbarossa.

Bishop Alberico di Merlino (1160–1168), who had joined the imperial schism, was excommunicated by Cardinal Joannes de Anagnia, the papal Legate, on 12 March 1160.

[31] In 1717, there were four dignities (Provost, Archdeacon, Cantor, and Archpriest) and fourteen Canons, one of whom was responsible for the souls of the parishioners of the cathedral.