[2] On 12 July 1173, a major fire destroyed nearly all of the city of Forlì, including the episcopal palace, the cathedral with its annexes, the other churches, and the monastery of S. Mercuriale, which housed the archives.

[4] On 8 July 1286, Archbishop Bonifacio Fieschi de' Conti di Lavagna of Ravenna presided over a provincial council, held in Forlì.

[9] The Second Vatican Council (1962–1965), in order to ensure that all Catholics received proper spiritual attention, decreed the reorganization of the diocesan structure of Italy and the consolidation of small and struggling dioceses.

Based on the revisions, a set of Normae was issued 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.

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