Medieval in origin, it was built together with the Benedictine monastery in 1106 at the behest of the giudice (local sovereign) Costantino. Inside are large votive candlesticks made of carved wood which on the 14th of August every year are carried in procession by the representatives of the gremi clad in XIX century costumes to celebrate the Discesa dei Candelieri (Descent of the Candlestick), Sassari’s most heartfelt festivity. The façade is divided into three sections: the lower has the door decorated with pensile arches and dates to 1236-1238. The two rows above it, graced with a large rose window under a gable, came about when the church was reconstructed in 1465. The interior is the result of a renovation project carried out by friar Antonio Cano between 1829 and 1834, together with the presbytery full of classic statuettes, raised decorations and paintings. You will see the Doric chapels, that of the Muratori and the six belonging to the other gremi, in Baroque style.