In 650 AD Fromond and some of his companions arrived to Brévands and established an abbey. Fromond became a bishop of Coutances he was died to the abbey in the year 690. In 871 Normans destroyed and looted the abbey. The new church was built in 1154 by Richard de Bohon, the bishop of Coutances. It was again destroyed by fire and the abbey church was rebuilt again with a massive Romanesque nave. It was demolished and rebuilt in 1766. The church was partially destroyed in bombings of summer 1944. Today the abbey church remains.
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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.