Søborg Castle, in its heyday, was the strongest castle in Denmark, and was also used as a prison. It was inhabited until the Count's Feud in 1535, when it is speculated that it was destroyed. In 1577, the feudal tenant was granted permission to use the ruins as a quarry.
Søborg Castle is first known from the 12th century, when ownership of the castle passed from the king to the bishop of Roskilde. Traditionally archbishop Eskil of Lund is said to have expanded the previous buildings to a real castle with defensive walls and a moat. As Eskil was in close contact with Esrum Abbey, it is considered likely that he lived nearby at Søborgby.
In 1985, Robert Egevang and Søren Frandsen took the initiative of digging two trenches to make clear the conditions between the octagon tower and the castle proper. A rampart approximately 11 meters wide is the oldest encirclement of the castle. In the rampart, as well as in the octagon tower which was built at the same time, tiles have been found. The excavations show that the castle proper was erected in the late 13th century, which would make it unlikely that Eskil was the builder, as he died in 1181. The tiles are very unevenly made, evidence of their novelty in Denmark, after having only recently arrived from Lombardy.
In the Middle Ages, the castle was on an island in a fjord with an outlet to the Kattegat by Gilleleje. Later, the fjord became Søborg Sø, which was drained 1872-1896 when a canal was dug to Gilleleje.
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.