The church and monastery of San Vittore al Corpo was built by the Olivetan order in the early 16th century. The site once had a 4th-century basilica and mausoleum that once held the burials of the emperors Gratian and Valentinian III. The basilica was enlarged in the 8th century to house the relics of the saints Vittore and Satiro. A Benedictine monastery soon was attached to the church. In 1507, the monastery was transferred to the Olivetans, who began a major reconstruction.
During the Napoleonic wars, the site became a military hospital, and afterwards became barracks. It suffered damage during the bombardments of 1943. The monastery now houses a museum of science. Reconstruction of the church was begun in 1533 by Vincenzo Seregni, and completed in 1568 by Pellegrino Tibaldi. La façade remains incomplete. The dome was frescoed in 1617 by Guglielmo Caccia. In the chapel of St Anthony is a 1619 canvas by Daniele Crespi (Death of St Paul the hermit). In the transept on the left, is an early 17th-century cycle of canvases of the Stories of San Benedetto, by Ambrogio Figino while the right transept has an altarpiece by Camillo Procaccini. Other chapels have paintings by Pompeo Batoni and Giovanni Battista Discepoli.
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.