From about 1233 the Bamberg bishops had the Romanesque Griffen parish church enlarged and rebuilt as a Premonstratensian monastery. The first canons descended from Vessra Abbey in the Franconian County of Henneberg. The monastery complex was completed in 1272 and significantly enlarged by Baroque buildings in the 17th century. Griffen remained the only Premonstratensian abbey in the Inner Austrian lands until its abolition under the rule of Emperor Joseph II in 1786.
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.