This is one of the most attractive and well-proportioned squares to be seen. The robust bell towers give this beautiful church the appearance of a fortress. The towers were built in the Middle Ages but the façade was redesigned later in the Mannerist-Baroque style. Imposing and overlooking the square, it has a three-storey façade decorated with niches containing statues and triangular windows above them. The interior has a knotted rib vault with maritime motifs extending over three naves and a very holy atmosphere, evident in the excellent carved gilt 17 th. century high altar. There are also stalls in Brazilian wood and an Italian marble sculpture of Christ on the cross.
A medium-sized cloister serves as an annexe (and completes the square on the outside perpendicular to the façade of the church). It has two storeys and is intricately designed. The lower floor is entirely in the Italian Renaissance style, with columns decorated with Ionic capitals and half arches. The upper floor, added later in the 18th. century, has a touch of the Baroque style with Tuscan columns.
Medieval sculptures from the 12th. century, images from the 15th. and 16th. centuries and Baroque items, together with a collection of ancient ceramics are also on display.