Co-cathedral of Ferentino

Alatri Cathedral was built in several phases during the Middle Ages, on the ruins of an ancient temple dedicated to Saturn. The present façade and bell tower were added by Jacopo Subleyras between 1790 and 1808, and in 1884 the attic and tympanum were added.

Anagni Cathedral dates back to the 11th century. The town of Agnani was one of the secondary centres of the papacy from the 11th century and remained so until the 13th century. The construction of the cathedral, decided by Bishop Pietro da Salerno, began in 1071 on the site of the ancient acropolis where a previous cathedral dating back to the High Middle Ages had already been built. It was essentially completed in 11053 and then, during the 13th century, underwent various stylistic modifications in the Gothic style, particularly the central nave and the apse.

The monastery of San Domenico has been a Benedictine abbey since 1011, and a Cistercian priory since 1222. Monastic life ceased in 1653, but the monastery was repopulated by the Casamari in 1833 and still exists today. The monastery's church has been a parish church since 1935 and has held the title of minor basilica since the celebration of the millennium in 2011. The Cistercian character of the church has been preserved despite the damage caused by earthquakes.