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:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.