The church was built by the
Pisans in their stronghold overlooking the city, Castel di Castro. It has a square plan, with a nave and two aisles, the latter having
cross vaults, while the nave had a wooden ceiling. In 1258, after the Pisans had destroyed the capital of the
Giudicato of Cagliari,
Santa Igia, and its cathedral, it became the seat of the
diocese of Cagliari. In the 14th century the
transept was built, giving the cathedral a
Latin cross groundplan, and the two side entrances. The façade received a Gothic
mullioned window and the bell tower was also modified. From the same period the first chapel comes, in
Italian Gothic style, in the transept's left arm. The right transept was completed after the conquest of Cagliari by the
Aragonese, and two additional chapels were built. In 1618 the
presbytery was elevated in order to build a sanctuary for several relics of martyrs. The interior and the façade were re-structured in
Baroque style in 1669–1704. A cupola was built at the center of the transept, and the latter's Gothic chapels were removed. 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. ==Artworks==