The ancient parish church, dedicated to S. Maria del Prato and then to St Peter and finally to S. Rocco, together with the adjoining ancient cemetery, was probably built toward the XII century according to masonry structures more ancient of the house and of the bell by the clear forms Romanesque architectural. The church has undergone over the centuries various rearrangements due , among the many reasons, also to the frequent floods coming from the nearby Rio della Rossa; is clearly legible superelevation of the Church while the bell tower has the first floor completely underground. Furthermore the religious building was turned to the contrary” with the demolition of the original apse, the plugging of the triumphal arch and the embodiment of the access door. To the west – where originally there was the facade and entrance- was built a new polygonal apse and two side chapels that delimit a transept never existed.
During the restoration works, in the phase of the excavation of the ancient apse was found a piece of good jewelry, bronze and enamel, depicting the Crucifixion, now at the Diocesan Museum of Susa and further surveys have revealed a part of the fresco in the triumphal arch, considered by the experts as perhaps the oldest existing in the valley. Originally belonging to the Church of Santa Maria del Prato is a valuable painting of the Seventeenth Century portraying the Virgin of Suffrage, now preserved in the parish church of San Pietro in Vincoli.