St. Peter and St. Paul's Cathedral is the cathedral church of the Roman Catholic Apostolic Administration of Estonia. Catholicism was introduced to Estonia by force via the Northern crusades and dominated religious life during the Middle Ages. However, following the Reformation during the 16th century, Lutheranism took its place as the dominant faith, and during the time of Swedish rule in Estonia, Catholicism was banned.
Following Sweden's loss of Estonia to the Russian Empire during the Great Northern War, religious freedom was introduced by the new authorities. In 1799, the Catholic parish had grown large enough to be granted the former refectory of the long-since closed St. Catherine's Monastery as a place of worship on the site of the present church. In 1841, designs were made for a proper new church building for the site, which had grown too small. The architect was the well-known St. Petersburg architect Carlo Rossi. He designed a neo-Gothic basilica, without an apse, with a neo-classical exterior.
Between 1920 and 1924, the main, western façade received its present look, a work by architects Erich Jacoby and Franz de Vries somewhat deviating from Rossi's original façade. The interior of the church still reflects Rossi's design, however the wooden, neo-Gothic decoration has been removed. The cathedral has undergone a series of renovations, the latest in 2002–2003.
The cathedral incorporates several works of art, including works by local Baltic German artists Carl Sigismund Walther, Robert Salemann and a copy of a painting by Guido Reni.
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.