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In its present form, the Cathedral of St. Lawrence in Tivoli dates to the mid 17th century when it was completely rebuilt by Cardinal Giulio Roma, Bishop of the Diocese of Tivoli.
Tradition recounts that the church already existed in the reign of Constantine, having been built on the ruins of the ancient Tiburtine forum and consecrated to the martyr Lawrence.
Probably enlarged during the 12th century, the church had a rectangular floor plan with a nave and two aisles ending in a semicircular apse. Over time, the church fell into ruin until restructuring took place in 1635 thanks to the generosity of Cardinal Roma.
The rectangular, barrel-vaulted Sacresty holds two large frescoes of the Pietà (at the back) and St. Lawrence in Glory (centre vault), which have been attributed to Gian Francesco Grimaldi (1606-1680) by the historian G.Carlo Crocchiante.
Seen from the exterior, the Sacresty is a large rectangular body added to the left side of the church, with large rectangular windows. On the same side, at the height of Piazza Domenico Tani, there is a large portal, commissioned in 1747 by the canons of the cathedral.
To the left of the facade is a three storey bell tower with arches, mullioned and arched windows and a pyramidal top.

Galleria fotografica