The construction of St. Sauveur Basilica was commissioned around 1120 by Sir Rivallon le Roux, Lord of Dinan, on his return from the first Crusade. The church was extensively rebuilt and extended during the 15th and 16th centuries and is a successful blend of architectural styles. The lower part of facade is part of the original 12th century building. The bell tower was built during the 18th century to replace the 17th century dome which had been destroyed by lightning.
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.