The castle of Arena was built by the Norman king Roger I the 11th century, to protect the pass of Berra and to defend the dominions on the Tyrrhenian side of the greenhouses against the risk of potential attacks from the eastern side, where Byzantines and Arabs had important positions.
The administrative and military control of the feud of Arena was entrusted to the Conclubet family, which for over 600 years was confirmed in power by the different dominations that succeeded one another in Calabria ultra, to which the Acquaviva dukes took over in the sixteenth century.
The ruins of the castle, substantially destroyed by the earthquake of 1783, preserve the Norman architectural structure, with large perimeter walls and the main building in the shape of a quadrilateral.
At the corners of the quadrilateral there are four partially preserved towers, belonging to different periods during which the castle underwent various technical – defensive adaptations.
Thus, in the Angevin age, the original quadrangular towers with smooth shoe of the Norman tradition, were replaced on the eastern side by high towers with a circular base and grooved shoe, the latter aimed at increasing the results of the so-called “plumbing defense” technique. increasing the range and lethality of the projectiles launched from the walls. Just the grooved shoe base is a constructive rarity since the typical Angevin tower had a smooth shoe.
On the western side, the Norman towers were modified only in the Aragonese period, when the development of artillery made it necessary to lower and strengthen them.
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.