The small church was likely built during the Middle Ages, near the Belvedere Tower. Today, only a few fragments remain: some 10th–11th century capitals scattered throughout the castle, along with remnants of walls, flooring, and the base of a column embedded in the city wall, facing the moat.
The church featured a simple layout and a semicircular apse. It functioned both as the spiritual centre of the castle’s court and as the dynastic burial site of the Caetani family. Chronicles attest to the presence of 14th-century frescoes, now lost.
During the Borgia period, the Church of San Pietro in Corte was destroyed, and its stones were reused in new constructions as an act of damnatio memoriae, erasing a symbol of the family’s power and devotion. Today, only the area where the church once stood remains in the Piazza d’Armi, bearing witness to the historical layers of a fortress that functioned simultaneously as a stronghold, a residence, and a centre of faith.
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