It is the main church of Ostra, a splendid example of neoclassical art. Built after the year 1000, it was initially an abbey of the Benedictine monks.
...In November 1795, Pope Pius VI erected the church as a Collegiate, entrusting it to a college of canons and an archpriest appointed by the Pope. In November 2008 it was elevated to the dignity of a Minor Basilica. The old Romanesque church, called four columns, was completely rebuilt between 1848 and 1851, as it was too small and in great decay. After the war, the bell tower was also rebuilt, damaged by cannon fire.
Inside, a Mater Dolorosa painted on copper plate of Flemish origin and the Chapel of Ss. Sacramento, entirely decorated with a canvas painted by Florentine artists, simulating the fresco.