Geeraard de Duivelsteen is a Gothic building in Ghent, Belgium. It served as defense of the Portus Ganda, the city's port. The building was built in the 13th century and was named after the knight Geeraard Vilain (1210-1270), second son of the fifteenth viscount of Gent, Zeger III of Ghent. Vilain's nickname was Geeraard de Duivel ('Geerard the Devil'), which was based on his dark complexion and hair color.
In the 14th century the building became city property. Over the course of centuries it was used for various functions; gatherings of knights, as an armory, a monastery, a school, a bishop's seminary, an insane asylum and a prison. In 1775 the Rasphuis near the Coupure channel became the new prison. In 1830 the Geeraard de Duivelsteen became a fire station. Near the end of the 19th century it was bought by the Belgian state to serve as a national archive. For this purpose a new wing was built. Due to the numerous restorations the building has changed a lot since the Middle Ages.
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.