[2] The diocese and the city of Susa lie on the main route that leads to Italy from the Mont Cenis Pass and the Col de Montgenèvre.

He ordered that they form a Collegiate Chapter, consisting of four dignities (Archdeacon, Archpriest, Provost, and Treasurer) and fourteen Canons.

[6] On 3 August 1772 a diocese was created by Pope Clement XIV in the bull Quod nobis out of this prelacy nullius, ex monasterio abbatia nuncupato Sancti Justi oppidi civitatis nuncupati Secusii nullius dioecesis provinciae Taurensis, and the territory of Novalesa Abbey was added to that of Susa.

[7] The Pope also ordered his representative, Cardinal Carlo Vittorio Amedeo delle Lanze, to acquire properties which had belonged to the Canons of S. Giusto to be used for a new diocesan seminary, in accordance with the decrees of the Council of Trent.

[9] The most famous native son of the province of Susa is Cardinal Enrico de Seguso, known as '(H)Ostiensis', the most distinguished canonist of his age.

King Victor Amadeus died on 18 October 1796, and his son and successor, Carlo Emanuele was forced to abdicate on 6 December 1798.