[1][2] Prior to the creation of the Kingdom of Italy, it belonged to the Papal States, and was located in the region of Umbria.
The pope appointed an Apostolic Administrator for the diocese of Bagnoregio on 8 June 1970, and the bishop was not replaced when he died in 1971.
According to tradition, St. Ansanus preached the Gospel here in the third century and the church of Santa Maria delle Carceri outside the Alban Gate was said to have been built above the prison in which he was confined.
The latest known bishop of Bomarzo is recorded in the Roman synod of Pope Benedict VIII in 1015.
[10] In 1913, the Diocese of Bagnorea contained 24 parishes; 106 churches, chapels, and oratories; 54 secular priests, 45 seminarians, 63 members of female religious orders, 2 schools for girls, and a population of 26,380.
There had been three foreshocks earlier in the month, which drove people from their homes, but the earthquake of 11 June destroyed everything, leaving not a single building intact.
The transfer of the episcopal seat was ordered by Pope Innocent XII in the bull Super Universas Ecclesias of 19 February 1699.
This uncanonical act was never approved by Pope Pius VII, who was a prisoner of Napoleon at Fontainebleau until 1814.
[16] A diocesan synod was an irregularly held, but important, meeting of the bishop of a diocese and his clergy.
No longer a residential bishopric, Bagnoregio is today used by the Catholic Church as a titular see;[89] holders of the title have been: