The Diocese of Tuscanella (Latin: Tuscaniensis) was a Latin Church residential bishopric of the Catholic Church, in existence by the 7th century.
[1] Even at the time of the Lombard invasions, it belonged to the Duchy of Rome and was immediately subject to the Pope.
[3] On 22 February 852 Pope Leo IV, in the bull Convenit apostolico, addressed to Bishop Virbono, confirmed the jurisdiction of the bishop over the churches and possessions of his diocese.
[4] This document is revealing, because it not only describes the towns and parishes dependent on the bishop (including Montalto, Tarquinia and Viterbo), but also details the boundaries of the diocese.
The name, though not the diocesan structure, was revived as the Latin Catholic titular see of Tuscania in 1991.