The particular complexity of the current ecclesiastical organization of the Lazio region, in addition to being the result of the historical stratification that took place over the centuries, also depends on the fact that the civil region of Lazio itself is the result of a recent administrative organization, which contradicts to varying degrees the ancient historical data. Currently made up of twenty-one dioceses, the current territory of its ecclesiastical region - including the Pontine Islands (Gaeta) - has borders that almost totally coincide with those of the Italian administrative region of the same name, with the addition of some municipalities of the Marsican land of Abruzzo: Morino, Balsorano, Canistro, Civitella Roveto, San Vincenzo Valle Roveto (province of L'Aquila), and Campania: San Pietro Infine and Rocca d'Evandro (province of Caserta); with the exclusion of a municipality in the Viterbo area, Bolsena, and two in the Rieti area, Configni and Vaconeri. The decisive presence represented by the enclave of the Vatican City State means that its very particular pastoral situation is strongly affected both by the centrality of the city of Rome as the seat of the pope's diocese and its numerous departments (Roman curia), and as the capital of the Italian republic. The use of the term "Lazio", if referring to historical periods prior to the unification of Italy, therefore appears anachronistic, as it originally indicated only the area of the ancient Latium, consisting of the territories that extended south of Rome, for 50 miles from the Tiber to the Circeo. Moreover, even today its territory includes, in the southern part, some areas that were part of the ancient Kingdom of Naples and which, after the unity, continued to be part of Campania, only to be aggregated to that of Lazio at the time fascist. In the coastal area, the whole stretch that extends from Terracina towards Minturno, where Gaeta is located, for centuries an important stronghold of the southern kingdom, suffered this fate. Furthermore, in its territory there were and still are present not only different realities, but also originally linked to surrounding regions (such as Tuscany, which greatly influenced the Roman Tuscia, or the Patrimony of St. Peter), as well as recording the important presence of suburbicarian dioceses and territorial abbeys. The term "suburbicario", which in its juridical meaning indicated the neighboring districts to the territory of Rome, was also used to indicate the episcopal see adjacent to the city.