The upper castle of Arnad is mentioned first time in a papal letter in 1207, but there is no information about its origins or first owners. It was probably built by Saverio di Arnad in the late 12th or early 13th century.
The next owners, Vallaise family, lived in the castle throughout the 14th century. Due to the inadequacy of the structure and the lost military function, the castle was abandoned in the 15th century.
Today the castle lies in ruins.
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.