Theobald I ordered the construction of the Tiebas castle around 1250 and since then it has suffered throughout history.
It survived numerous attacks quite well until an attack by Castile in 1378 ended with it on fire. With it, burned a good part of the Navarre Archive, and this has deprived us of a lot of information about our history.
Luckily, in 1512, it managed not be demolished under Cardinal Cisneros. Then it witnessed a bloody battle in 1810 between four battalions under Espoz y Mina against more than 3,000 French soldiers.
In the end, after being abandoned, many of the stones were taken from the castle, and work is being done now to consolidate the structure.
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.