Roman Catholic Diocese of Nepi-Sutri

The diocese of Nepi-Sutri was a Roman Catholic ecclesiastical territory in central Italy, created in 1435 by unifying the diocese of Nepi and the diocese of Sutri. It existed until 1986, when it was united into the current diocese of Cività Castellana.

In the Gothic War Nepi was one of the last strongholds of the Goths. The town was sacked by the Lombards in 569. In the eighth century, however, it became the seat of Tuto, a Lombard dux, known for his interference in the papal election of 768.

In the struggle between the emperors and the popes, Nepi was imperialist during the reigns of Pope Alexander II, Pope Nicholas II, Pope Gregory VII, and Pope Innocent II; on the other hand, in 1160, it fought against the commune of Rome, and in 1244, was besieged by Emperor Frederick II. A feudal possession, first of the prefects of Vico, and then of the Orsinis, of the Colonnas, and of C�sar Borgia, from 1537 to 1545, it was erected into a duchy in favour of Peter Louis Farnese; and when the latter was transferred to Parma, Nepi returned to immediate dependence on the Holy See. In 1798 the French set fire to the cathedral and to the episcopal palace, and archives were lost.

The Church of Nepi, which venerates, as its evangelizer, St. Ptolemaeus, who, it is claimed, was a disciple of the Apostles. In 419, Eulalius, competitor of Pope Boniface I, was made Bishop of Nepi; Bishop Paulus was sent as visitor to Naples by Gregory the Great; Bishop Stephanus, in 868, was one of the presidents and papal legates of the Council of Constantinople against Photius.

...
Wikipedia