[3] An equally implausible claim is that all of Arezzo was baptized during the episcopacy of Bishop Dicentius in the 5th century.

[7] In 1677, the cathedral Chapter was composed of four dignities (the Provost, the Archdeacon, the Dean, and the Primicerius) and fourteen Canons.

[10] Between 1480 and 1485, Luca Pacioli, O.Min., a native of Borgo San Sepolcro, which is a distance of 16 miles (25 km) from Arezzo, visited the site, and described it as "utterly stunning."

In the bull "Insignes Ecclesias" of 1 November 1737, Pope Clement lauded the antiquity, faithfulness, and prestige of the diocese as a direct subject of the Roman Church, and conceded to its bishop in perpetuo archiepiscopal insignia, the pallium (which could only be worn inside the diocese, and on certain specified feasts and holy days) and the patriarchal cross.

Based on the revisions, a set of Normae was issued by the Vatican on 15 November 1984, which was accompanied in the next year, on 3 June 1985, by enabling legislation.

According to the agreement, the practice of having one bishop govern two separate dioceses at the same time, aeque personaliter, was abolished.

In Tuscany, this particularly affected three dioceses: Arezzo, Cortona, and Borgo San Sepolcro (Biturgensis).

There was to be only one diocesan Tribunal, in Arezzo, and likewise one seminary, one College of Consultors, and one Priests' Council.