Palestrina Cathedral

The first cathedral of Tivoli was built on the site of a Roman forum from the 8th century onwards. The church was profoundly restructured in the 11th century with the addition of a Romanesque campanile and the opening of three naves. In 1634 Cardinal Giulio Roma was appointed Bishop of Tivoli and in 1635 he immediately ordered the total reconstruction of the building, with the exception of the bell tower. The main part of the church was completed in 1640 and the consecration took place on 1st February 1641. Work on the façade and the portico was completed in 1650.

The Cathedral of Frascati was built from 1599 on the plans of the architect Ottaviano Mascherino (1536-1606) to cope with the increase in the city's population, which had become too large for the parish church of Santa Maria in Vivario. The construction was financed by an initial contribution from the Holy See, donations from the parishioners and, from 1608, by taxes on the famous local wine. The completion of the first works dates back to 1610. The present Baroque façade dates from 1696-1700 and is the work of Girolamo Fontana. The choir was rebuilt in 1703 and the side campaniles with clocks were added in 1747.

Velletri Cathedral was, according to tradition, a former basilica of the Roman town hall, which was transformed into a Christian church in the 5th century. In the 13th century the church underwent a major renovation with the construction of the polygonal exterior apse and the underground chapel containing the relics of St Eleutheran and St Pontian. The main entrance of the cathedral with its façade was incorporated into the construction of the Bishop's Seminary in the 17th century. In 1950, damaged by the war, the cathedral was restored to a design by the architect Giuseppe Zander.