St. Mary's Church, the parish church in which Luther often preached, was built in the 13th century, but has been much altered since Luther's time. The reformers Martin Luther and Johannes Bugenhagen preached there and the building also saw the first celebration of the mass in German rather than Latin and the first ever distribution of the bread and wine to the congregation - it is thus considered the mother church of the Protestant Reformation.
The first mention of the church dates to 1187. Originally a wooden church, in 1280 the present chancel and the chancel's south aisle were built. Between 1412 and 1439 the nave was replaced by the present three-aisle structure and the two towers built, originally crowned by stone pyramids. In 1522, in the wake of the iconoclasm begun by Andreas Bodenstein, almost the whole interior decoration was demolished and removed, leaving the still-surviving High Medieval Judensau on the exterior of the south wall. On his return to Wittenberg from the Wartburg, Luther preached his famous invocavit sermons in the Stadtkirche. In 1547, during the Schmalkaldic War, the towers' stone pyramids were removed to make platforms for cannon. Despite the war, an altarpiece by Lucas Cranach the Elder was unveiled in the church. In 1556 the platforms were replaced by the surviving octagonal caps, a clock and a clock-keeper's dwelling. This was followed by an extension of the east end and the overlying 'Ordinandenstube'. In 1811 the interior of the church was redesigned to a Neo-Gothic scheme by Carlo Ignazio Pozzi. The church was fully restored in 1928 and 1980-1983.
Since 1996 it has been a World Heritage Site together with other Luther Memorials in Eisleben and Wittenberg.
St. Mary's Church contains a painting by Lucas Cranach the Elder, representing the Last Supper (with the faces of Luther and other reformers), Baptism and Confession, also a font by Hermann Vischer the Elder (1457). In addition, there are numerous historic paintings in the church.
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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.