The Abbey Church of Saint-Pierre-sur-Diveswas was rebuilt in the 12th century and 13th centuries and restored and modified in the 16th and 17th centuries, replacing the former abbey church built in 1011 by William the Conqueror's aunt, Countess Lesceline. The church was entirely restored in the 16th century. By that time it got its general current appearance: a long main nave with two aisles and five radiating chapels, in the gothic style.
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.