But when he came to die in 1129, the Bolognese resisted the demands of Archbishop Gualterius of Ravenna that he should consecrate the newly elected Bishop Henricus.

The papal Legate, Gerardus of S. Croce in Gerusalemme, heard the dispute in his court on 13 April 1130, and Archbishop Gualterius established his right to consecrate the bishops of Bologna.

[5] In 973, Bishop Albertus participated in a provincial synod of the ecclesiastical province of Ravenna, presided over by Archbishop Honestus, and held in the village of Marzalia in the diocese of Parma.

[6] A major earthquake struck Bologna on Christmas Day, 1222, causing the vaults of the cathedral ceiling to collapse.

[8] Pope Leo X visited Bologna from 8 December 1515 through 18 February 1516, where he held negotiations with King Francis I of France.

[9] In 1568, as one of his efforts to implement the decrees of the Council of Trent, Bishop Gabriele Paleotti established the diocesan seminary of Bologna.

[10] In 1582 the diocese of Bologna was raised to the status of a metropolitan archbishopric by Pope Gregory XIII in the bull Universi orbis of 10 December 1582, which removed it from the ecclesiastical province of Ravenna.

[13] The Canons of the Cathedral Chapter were, according to information laid before the pope, interfering with the jurisdiction of the Archdeacon of Bologna.

On 28 March 1219, Pope Honorius III wrote to the clergy and people to support the Archdeacon against the rebellion of the Canons.

In separate letters, the Pope warned the Chapter and the Bishop not to interfere with the legitimate and canonical rights and jurisdiction of the Archdeacon.

[22] Cardinal Ludovico Ludovisi (1621–1632) held a Congregation of the diocese's archpriests on 9 March 1623, and then a diocesan synod on 8 June 1623.

He left his entire estate worth an estimated €1.7 billion euro to the diocese, including 66% of FAAC shares.