Around the third quarter of the 12th century Freiherr von Weissenburg donated land along the Simmen river to the Augustinian order for a monastery. The monastery was first mentioned in 1228 along with the surrounding village. In 1368 the Freiherr von Brandis inherited the Weissenburg lands including patronage of the monastery. It continued to expand during the 13th and 14th centuries as nobles donated lands and the monastery bought estates.
The monastery church of St. Mary became the burial church of the Freiherrs. In 1439 the city of Bern acquired the Weissenburg lands including the monastery and the village. In 1486 they forced the monastery to accept the authority of the college of canons of the Cathedral of Bern. In 1528, Bern adopted the new faith of the Protestant Reformation and secularized the monastery. The monastery church became the parish church of newly created parish.
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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.