In the 1930s it finally received the current façade, in Neo-Romanesque style, inspired by Pisa Cathedral.
The church was built by the Pisans in their stronghold overlooking the city, Castel di Castro.
In the 14th century the transept was built, giving the cathedral a Latin cross groundplan, and the two side entrances.
The old façade was demolished in the early 20th century, and replaced by a Neo-Romanesque one, along the same lines of the original design, during the 1930s.
Other artworks include a 15th-century Flemish triptych (also known as Triptych of Clement VII), attributed to Rogier van der Weyden, and the Baroque funerary monument to Bernardo de La Cabra, archbishop of Cagliari, who died in the plague of 1655, while the left transept houses a 14th-century chapel and the mausoleum of the Aragonese King Martin I of Sicily, built in 1676-1680.