The church of San Martino is known by all the Procenese as the church "of the friars" because in the Middle Ages it was part of a convent that stood to its right; initially the convent was inhabited by the Benedictines, but in 1258 it was handed over to the Friars Minor Conventual who resided there until Napoleon Bonaparte suppressed the religious orders and the monastery was demolished.
Of Gothic origin, it is assumed that the church was built around 1200. The façade, facing east, is almost empty; the travertine portal is surmounted by a recessed rose window of the same material.
The right side of the façade contains a section of wall in which a door belonging to the old convent opened. The bell gable is supported by a wall that starts about ten metres below the level of the church and rises above it for a few metres.
Inside, we can still see some remains of frescoes on the walls, the ceiling of the presbytery is ribbed, and the four ribs that determine it are made of tuff. At the back we can admire a large lancet window.
The churchyard is modest in size, with a small modern altar in the middle. The church was restored after the Second World War.