The first reliable evidence of feudalism in Bivona dates back to 11 October 1299, when Robert of Anjou, the King of Naples, granted the castles of Bivona and Calatamauro to Giacomo de Catania. The castle mentioned in this decree was probably a watchtower which had been built as part of the walls of Bivona around the time of the War of the Sicilian Vespers.
Eventually, the castle began to be built in the first half of the 14th century. In 1359, Guido and Francesco Ventimiglia almost destroyed it, but it was rebuilt within the same year by Corrado Doria. The land and castle of Bivona was passed to Nicholas Peralta in 1397. In 1406, it belonged to Francesco Castellar.
The castle was looted and partially destroyed in 1529, during the Secondo caso di Sciacca, a conflict between the de Luna and Perollo noble families.
Today, the castle is in ruins. Some parts of it are embedded in structures of a later period.
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.