The church originally had two naves: a central one and a lateral one. The lateral one on the north side was demolished in 1681.
“The interior is divided into three bays by three pointed arches in masonry, resting on rectangular pillars. The arches support a ceiling made of large bricks on which the roof rests directly.
The apse is large (the diameter is more than 6 meters) and is covered by a five-part vault.
Against the wall, the masonry altar is decorated with stucco in late sixteenth-century style, dating back to 1680.
Under the plaster, fragments of the ancient frescoes re-emerge, covered with whitewash carried out during an eighteenth-century restoration; the most notable are the one on the southern wall depicting Saint Peter, from the Romanesque period, and, near the side entrance, a fresco ruined in several places that portrays Saint Francis of Assisi while receiving the stigmata.
The Saint is portrayed kneeling with his arms open and slightly raised, with his gaze turned towards Christ, who appeared in the form of a Cherub; further down we can see the figure of a little friar who witnessed the event, with his hands raised to protect his eyes from the brightness of the apparition.
Behind the figure of the Saint is depicted the little church of Porziuncola.
The expressiveness of the faces, the attention to the folds of the Saint's habit and the architecture of the church in the background date this fresco back to a period before the end of the fifteenth century.”
From the municipality website: comune.carpignanosesia. No. It