The church was built in dark
basalt stone by
Pisan workers (the island in the Middle Ages was under strong influence from the maritime
Republic of Pisa). The façade is divided into five sectors and has a salient-shaped façade. In the middle is the portal, surmounted by a double
mullioned window. The whole exterior of the edifice is characterized by false columns (
lesenes) and
Lombard bands; on the right are the remains of the square bell tower, which is missing the upper part. The interior, on a rectangular plan, has a nave and two aisles divided by columns whose capitals have flower motifs. The nave has a wooden
trusses ceiling, while the aisles are
groin vaulted. In the semi-circular apse is the large
retablo, the largest 16th-century polyptych in Sardinia, located behind the high altar. The table portrays several prophets and saints, as well as episodes in the life of the
Virgin Mary. In the middle, within a niche, is the wooden statue of
Nostra Signora del Regno, a "Madonna with Child" wearing royal symbols. The polyptych is dated 1515. The church's columns have 17th-century paintings with Apostles and other Saints, while also present is a lesser retablo from the same school, a carved wooden
pulpit and an
epigraph celebrating the consecration of the church on May 7, 1107. ==References==