San Pietro Ispano church, Boville Ernica, Medieval church in Boville Ernica, Italy.

San Pietro Ispano is a church in Boville Ernica featuring a Latin cross layout with a central nave leading up six steps to a raised transverse section. Inside are three silver reliquaries, including one from the 16th century showing Saint Peter Ispano wearing a silver-plated mantle and halo.

The church first appears in a papal document from Pope Honorius II dated November 28, 1125, confirming its possession by the Bishop of Veroli. The site developed around the presence of Saint Peter Ispano, who lived in the grotto located beneath the presbytery.

The church is linked to the adjacent Filonardi castle by an internal staircase, and the name Silvio Filonardi appears on the architrave of the entrance portal, carved after his 1580 restoration. Inside, the Simoncelli Chapel, the first on the left, holds works Monsignor Giovanni Battista Simoncelli saved from the demolition of old Saint Peter's Basilica in Rome.

The church stands next to the Castello Filonardi in Boville Ernica, and an internal staircase once linked the palace directly to the church. The grotto of Saint Peter Ispano, in its original form, is in the crypt beneath the transept. The Simoncelli Chapel is the first chapel on the left as you enter.

The paleochristian sarcophagus kept to the right before the transept was found in 1941 during farm work in the Sasso district of Boville Ernica. Carved in the 4th century, it shows the three youths in the fiery furnace with Nebuchadnezzar on the left and the Nativity on the right, and survives practically intact.