It is the largest and most important in the town, probably built in the late 1500s, although the exact date is difficult to establish due to a fire in which the Cagliari Archbishop’s Archive was destroyed. The church, which was also used for a long time as a cemetery, was built of tufa blocks in the Gothic-Aragonese style. It is believed to have been built at the instigation of Don Emanuele of Castelvì. This hypothesis is supported by the fact that, in the façade above the portal, is placed the coat of arms of the Castelvì family, who, probably in remembrance of their region of origin or by imposition of the sovereign, wanted to dedicate it to Our Lady Morenita.
The exterior facade is smooth and gabled in squared tufa ashlars, has a splayed portal with an archiacute lunette and a central oculus. On the left side of the building is the square-bore bell tower.
The building has a Latin cross plan. The nave is characterized by pointed arches resting on capitals typical of late Gothic architecture, while the present chancel is enriched by a marvelous cross-vault with shaped corners set on corbels adorned with Gothic motifs. The final part of the room is covered by a dome.
