The dedication of the church is due to a simulacrum found in the countryside of Olmedo, near the archaeological site of Talia, named after the “Madonna of Italy.” The monument, however, is known as Santa Maria di Ulumetu or Olmeto, from the ancient toponym, attested in undated maps of the “Condaghe di S. Pietro di Silki” (12th-13th cent.). Built of limestone and volcanic stone, the church is the work of Tuscan-Lombard workers active in the first quarter of the 12th century and was restored in the late 1960s. The irregularity of the masonry on the façade and the differences in the materials used suggest two different building phases, one constructive and one related to a restoration, which took place at a stage not far from that of the planting.
The hall, 10 meters long and about 6 meters wide, is divided into three naves, of which the side naves are barrel-vaulted, while the central one has wooden roofing.
The façade features an architraved portal characterized by a rounded discharge arch. The top part of the facade is characterized by strong corner pilasters and a series of small arches that also continues on the sides of the church. It is completed by a cruciform opening and several ashlars with accommodation for ceramic basins. A number of single-lancet windows open along the sides of the building, which are also found in the southeast-facing apse, whose surface is punctuated by pilasters connected by small arches.
