Aggersborg, the largest Viking ring castle in Denmark
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Location | North Denmark Region, Denmark |
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Coordinates | 56°59′43.6″N 9°15′17.8″E / 56.995444°N 9.254944°ECoordinates: 56°59′43.6″N 9°15′17.8″E / 56.995444°N 9.254944°E |
Aggersborg is the largest of Denmark's former Viking ring castles, and one of the largest archeological sites in Denmark. It is located near Aggersund on the north side of the Limfjord. It consists of a circular rampart surrounded by a ditch. Four main roads arranged in a cross connects the castle centre with the outer ring. The roads were tunnelled under the outer rampart, leaving the circular structure intact.
The ring castle had an inner diameter of 240 metres. The ditch was located eight metres outside of the rampart, and was approximately 1.3 metres deep. The wall is believed to have been four metres tall. The rampart was constructed of soil and turf, reinforced and clad with oak wood. The rampart formed the basis for a wooden parapet. Smaller streets were located within the four main sections of the fortress.
The modern Aggersborg is a reconstruction created in the 1990s. It is lower than the original fortress.
Dating the structure has proven difficult, since the archaeological site has also been the site of an Iron Age village. The ring castle is believed to have been constructed around 980 during the reign of king Harold Bluetooth and / or Sweyn Forkbeard. Five of the six ring castles in historical Denmark have been dated to this era. The structure was completed within one or two years, and only used for a short period of time; between five and twenty years.
Archaeologists have estimated that the ring castle could hold a 5,000-man garrison, located in 48 longhouses. Twelve longhouses were located in each quadrant, all located on a north-south or west-east axis. No remains of the actual houses exist, but proof of the location of the walls has been found. The individual houses are believed to have been similar to the form seen on the Camnin chest, a house-shaped reliquary, as well as on house-shaped tombstones in England.