A church at the site of current Basilica of San Maurizio is documented since 1078, when the bishop of Turin, Cuniberto, acknowledges the donation of this and other churches to a monastery in Pinerolo.
The documents also refer to an arduous major reconstruction starting in the 1440s and completed sometime in the early 17th century, when the nave was finally roofed. The new church was reconsecrated in 1635. Sometime around 1665, damage to the church was caused by lightning strike, but even more dramatic an explosion near the monastery of St Clare in Pinerolo killed 400 townsfolk, who were initially brought to the church awaiting burial. The mass of cadavers led to a closure of the church. In 1691, the church was used to store grain in expectation of a siege of the town. Some damage occurred to the church during a siege two years later.
The bell-tower, dating 1336, was built in a Romanesque style. The interior of the church contains frescoes depicting the Ascension of Christ by Giuseppe Antonio Petrini and the main altarpiece canvas depicting the Birth of the Virgin by Claudio Francesco Beaumont. The church was again restored in 1897, including frescoes by Gabriele Ferrero. The church has numerous side chapels. It was raised to a minor basilica in 2002.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.