The Casale di Roma Vecchia is one of the best surviving examples of an old Roman Campagna fortified farmstead, built in the13th century but substantially altered since. Especially, an original defensive tower has been cut down and remodelled.
The little chapel attached was a public place of worship dependent on San Sebastiano fuori le Mura, serving a very thin rural population. Its last restoration was under the Torlonia family in 1797. The date of the last public Mass seems to be unrecorded, but the later 19th century is a good guess.
The compact complex, which is private, is irregularly built and has a massive arched portal in its front screen wall. The chapel seems to have been the little building attached to the corner to the right, outside the wall and hence readily accessible to the public when it was in use.