The church is what remains of the Sessano village in Chiaverano, located on the rocky promontory East of the town and probably abandoned after a landslide. The building (XI Century) is contemporary with other churches in the area that have in common the peculiarity of the bell tower (clocher-porche) located at the centre of the facade.
The current church is single nave with three spans and end apse where a sacristy was added (at the South) in Baroque era. Outside of the semi-cylindrical apse there are four pilasters that divide it into three fields, where the same amount of mullioned windows; on the top there are twelve aligned recesses with exposed brick arches as well as a sawtooth frame with a rock sheet roof above it. Internally the apse has precious frescos from the XI Century: at the centre of the bowl-shaped vault the Christ surrounded by the symbols of the four evangelists and below fourteen figures of Apostles and Saints.