The former cathedral is the only surviving building from medieval Tatalia. The building, in limestone and trachyte, is based on a high plinth into which the corner pilasters and pilasters that mark the sides externally are inserted.
The facade is divided into two orders. The lower area is tripartite and has smooth lateral mirrors, decorated only with a lozenge, while in the center is the portal, with an architrave and surmounted by a round arch with a ring decorated with plant motifs. In the upper order opens the rose window, with a polylobed oculus. The tympanum above the second order has an opening from which some steps lead from inside the church to the roof. Both the facade and the side walls are decorated with hanging arches, which rest on sculpted corbels. The side portal of the south elevation is similar to the one on the façade, while the north portal is surmounted by a pointed arch.
Retablo
The interior has a rectangular plan, divided into three naves by pillars and round arches, with a semicircular oriented apse. The naves are covered with wooden trusses. The light enters through the various lateral single-lancet windows, from the rose window on the façade and from the pointed-arched mullioned window above the apse. In the left aisle there is a small sixteenth-century altarpiece
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