It melts your heart at first sight. The church appears in all its majesty rather unexpectedly, on a hillock in the main street of Santa Giusta, at the end of a majestic set of stairs: a gem of Romanesque architecture, model for nearby churches, including San Pietro di Terralba. Although it was the cathedral of the Santa Giusta dioceses, active until 1503, no document attests to its date of construction; it is estimated to have been built between 1135 and 1145. Its shapes, built under the direction of Tuscan masters, are clearly Romanesque-Pisan, very similar to those of the cathedral of Pisa.