The collegiate church of San Lorenzo was built in Zagarolo on the remains of a church of the tenth century and has had several architectural interventions over the centuries.
The façade is attributed to Carlo Maderno and, at the top, closes with a high tympanum supported by two rows of pilasters.
The left wing of the church ends with the bell tower.
The plan is a Latin cross and inside are preserved significant works of art, including a triptych of the SS. Salvatore, painted at the end of the 16th century by Antoniazzo Romano, works by Cavalier d'Arpino and stuccos from the 17th century.
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