San Gaudenzio is a Baroque architecture church in the town of Ivrea. Tradition holds that the church is located on a site where St Gaudentius in the year 348 had lain down on a rock overnight, and his body miraculously left an imprint on the rock. The church was constructed between 1716 and 1724 at the site of a former castle. The bell tower was built in 1742. The architect remains unknown, although the rococo design of the facade with a convex front and an oval tympanum appears influenced by Bernardo Antonio Vittone. Some attribute the design to Luigi Andrea Guibert, active in Ivrea between 1714 and 1719. The interior contains frescoes (1738–1739) by Luca Rossetti.
The church has a number of paintings depicting the scenes in the Life of St Gaudentius, including a Glory of the Saint in the apse, behind the main altar. One is a procession leaving the chiesa di San Gaudenzio with the city in the background.
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.