[1][2] In the year 1014, the Emperor Henry II, on the occasion of his own coronation in Rome, obtained from Pope Benedict VIII the erection of the Abbey of Bobbio, which was celebrating its 500th anniversary, as an episcopal see.

[5] The abbot of Bobbio had long been a Count of the Holy Roman Empire in the territory of the Abbey, and he owed feudal dues, including soldiers, when called upon.

[7] Pietroaldo, its first bishop, had been Abbot of Bobbio since 999; in contemporary documents he is referred to as abbas et episcopus monasterio sancti Colombani sito Bobio.

[10] Pope Eugenius III (1145–1153) ruled that the confirmation and blessing of a new abbot, the consecration of altars and churches, and the appointment of monks and clergy, were the right of the bishop of Bobbio and his successors; the decision was confirmed by Pope Lucius III (1181–1185) when further litigation took place.

[12] According to Ferdinando Ughelli and others, the diocese Bobbio was made a suffragan see of the Metropolitan Archdiocese of Genoa by Pope Innocent II on 19 March 1133 in the Bull Iustus Dominus.

[13] Fedele Savio finds this subordination mentioned for the first time in a Bull of Pope Alexander III, dated 19 April 1161, but in his discussion he remarks that Genoa was only given four suffragans: Mariana, Nebbio and Accia on the island of Corsica, and Brugnato on the mainland.

[16] In 1199 alarming reports reached the ears of Pope Innocent III about the corrupt state of discipline in the monastery of S. Colombano, "that there was hardly a trace of religious feeling in either the abbot or the monks."