This church was built on a previous
church of the 12th century, which was demolished because it was
too small to meet the cult's requirements of the town. This
initial church was built on a chapel where, according to the legend,
the Apostle Peter had preached the Gospel.
Its structure was determined by the particular shape of the
place where it is built, at the centre of the ancient town.
The architect commissioned to project the church was Nicolò
Michetti, who followed the structure of the Zagarolo's
previous monuments. The works began on the 30th June 1717.
Michetti abandoned the building yard (1718) as he was called
by the Russia's Tsar Peter I the Great, and therefore
the church's construction continued under the direction
of the architects chosen by the Rospigliosi Family: Ludovico
Rusconi Sassi e Gerolamo Caccia. The church is characterized
by a baroque style and an elliptic plan. The elliptic dome has
an high warning light, visible from very far.
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