World Heritage Photos

Viking-Age Ring Fortresses – Masterpieces of King Harald Bluetooth

Five historic Danish Viking-Age Ring Fortresses were declared a UNESCO World Heritage Site in 2023. The fortresses were built between 958 and 987 under the reign of King Harald Bluetooth. They are among the most important archaeological remains of the Viking Age in Denmark.

The Viking fortresses are spread all over Denmark, each built in a strategic location. Aggersborg, the largest of the five, was built around 980 CE on the banks of the Limfjord near the town of Løgstør in Northern Jutland. On the island of Zealand, Borgring was built in front of Køge Bay, not far from Stevns Klint. Trelleborg was also built around the year 980 CE close to the town of Slagelse. Fyrkat was constructed around 980 CE near the town of Hobro in Northern Jutland. Nonnebakken, also built in the same period, now lies hidden beneath the city of Odense on the island of Funen. 

The great structures built under the reign of King Harald Bluetooth included ring fortresses, bridges road networks, and a royal residence at Jelling. During this era, the Vikings embarked on expeditions to other countries to trade and build new settlements, but also to raid and plunder. These Viking-Age Ring Fortresses are important remains of this period in Denmark, and together with the monuments at Jelling and Roskilde Cathedral, are renowned parts of the turbulent history of Denmark. 

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   Trelleborg was built around 980 as one of Denmark's strategic Viking-Age ring fortresses. The circular ramparts surrounding the fort were 17 metres wide and 5 metres high, constructed from turf, stone and clay. These massive earthworks were encircled by a dry moat and featured four gates strategically facing the cardinal directions; these covered wooden tunnels ran straight through the ramparts. Trelleborg is one of the five historic Viking-Age Ring Fortresses that were inscribed on the UNESCO World Heritage List in 2023. 

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   Trelleborg ring fortress was likely built on the orders of the legendary Viking king Harald Bluetooth. This impressive military stronghold almost certainly served as a trading hub as well. Within the imposing circular rampart, the locations where the walls and uprights of the wooden longhouses once stood are now marked with concrete stones. Archaeological excavations of the ring fortress took place between 1934 and 1942. The unique historical finds are now on display at the adjacent Trelleborg Museum.

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   The reconstructed longhouse standing at Trelleborg Fotress was built in 1942 as a model of the buildings that once stood within the fortress's earthen ramparts. The original longhouses were virtually identical, measuring over thirty metres in length with curved walls made of thick planks and roofs supported by solid wooden beams. It is generally assumed that these sturdy wooden structures were also painted and decorated with fine wood carvings. Trelleborg is located near the town of Slagelse on the Danish island of Zealand. 

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   The interior of the reconstructed longhouse at Trelleborg reveals how the inhabitants lived during the Viking Age. This fortress was inhabited by Viking warriors and their families, who were likely part of King Harald Bluetooth’s personal guard. It is estimated that the fortress was home to around five hundred people; alongside the warriors, the population included skilled craftspeople, women, children and enslaved people. This mighty Viking stronghold was likely inhabited for only fifteen years or less.

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   The museum at the Trelleborg ring fortress houses a collection of warrior equipment recovered from within and around the Viking-Age fortress. The most unique find is a wooden Viking shield. This round shield was discovered during excavations in 2008, approximately fourteen metres from the south gate. It is made from wood taken from trees felled in Norway in the late ninth century. Traces of paint indicate that it was originally painted red and white. In addition to this equipment, archaeologists have found evidence of a fierce battle within the fortress, including burnt gates and mass graves containing young men killed by arrowheads and swords.

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   The remains of the enormous Aggersborg ring fortress are bathed in the warm evening light of a sunset, with the vast Limfjord in the background. The fortress was built around 980 during the reign of Viking King Harald Bluetooth. Today, the earthen ramparts and the moat are the only visible remains of the fortress. Several smaller Viking fortresses were built at the same time as Aggersborg, including Nonnebakken, Borgring, Fyrkat and Trelleborg. Together, the remains of these five Viking-Age ring fortresses became a UNESCO World Heritage Site.

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   The earthen ramparts and dry moat of the ring fortress of Aggersborg, with the Limfjord in the background. This elongated inland sea is open to both the east and the west and offered a safe passage between the North Sea and the Kattegat; the fortress was therefore perfectly situated for access to the main sailing routes of the Vikings as well as for controlling the Limfjord area. From this fortress, the Vikings undertook their trading voyages and raids. During excavations on the site, more than 30,000 artefacts have been recovered from the Viking Age, including many valuable, imported luxury goods such as beads, glass and gold objects.

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   Aggersborg Fortress lies on a hillside at one of the narrowest points of the amazing Limfjord. Aggersborg is both the oldest and largest of the Viking-Age ring fortresses in Scandinavia. The fortress consisted of a circular rampart, nine metres wide and four metres high; its diameter was approximately 240 metres. This stronghold had four gates, facing north, east, south and west. The courtyard inside the ramparts contained 48 large timbered longhouses. Aggersborg is the largest Viking fortress discovered to date. Historians estimate that this enormous fortress accommodated a massive military force of 5,000 troops.

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   The Viking-Age Ring Fortress of Aggersborg is situated next to the Aggersborg Church and offers a magnificent panoramic view of the Limfjord. The oldest parts of the church were built in the early 1100s. Traces were found beneath the church of an older church and several graves from the 11th century. During restorations works in the 1970s, several smaller runic inscriptions were discovered. These runes were scratched between 1150 and 1536 into the whitewash layers of the church and consisted of the name 'Maria' and the sentence: 'May God remain with Thorlek of Hæra. Stand there! Peter Svale wrote this. Amen'.

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    A beautiful sunset over the ring fortress of Aggersborg and the eleventh-century Aggersborg Church. At the time, this church was partly made of wood and was only later built of granite. By the end of the Viking Age, around 1050, most Vikings had become Christians. Churches were built everywhere, but whether Aggersborg Fortress had a church or cemetery remains to be discovered. The conversion to Christianity is symbolically marked by King Harald Bluetooth's rune stone at Jelling. Aggersborg Church is situated in one of the most beautiful spots in this region, overlooking the Limfjord.

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    Fyrkat Fortress was built around 980 and formed part of a huge military network of ring forts, including Aggersborg and Trelleborg. Fyrkat has a diameter of 120 meters. The rampart, which is over three metres high and twelve metres wide, enclosed sixteen longhouses distributed across four residential blocks within the earthen embankments. This imposing rampart features four gateways positioned strategically at the four cardinal points. The exact positions where the longhouse walls once stood are now marked with white concrete blocks. This Viking-Age Ring fortress was in use for approximately twenty years before being abandoned.

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    The earthen ramparts and dry moat of Fyrkat Fortress, with a reconstructed Viking longhouse visible in the background. The house is an exact copy of one of the sixteen longhouses whose archaeological remains were found within this Viking-Age fortress. This wooden building is 28.5 metres in length and 7.5 metres wide in the middle and tapers to a width of five metres at the gables. The walls of these Viking houses were curved to create their boat-like shape. Other types of houses were also found inside the fortress.

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    The reconstructed longhouse at Fyrkat stands close to the earthen rampart of this Viking-Age ring fortress's. The Viking wooden longhouses were erected in the shape of an upside-down boat. A typical longhouse was divided into three sections: a large central hall and smaller rooms at either end. Longhouses had four entrances, consisting of a door in each gable end and a door in the middle of each long side wall. The walls were constructed from sturdy wooden planks. On the outside, a row of angled support beams helped bear the weight of the heavy wooden roof.

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    The vibrant Fyrkat Viking Museum is located next to the remains of the Fyrkat ring fortress. It consists of a Viking farmstead and several reconstructed wooden longhouses. Together, they form the traditional residence of a Viking chieftain, as it would have appeared during the time of King Harald Gormsson, better known as King Harald Bluetooth. The houses were reconstructed based on archaeological remains of Viking dwellings dating back more than a thousand years. The fortress is situated on a strategic headland just outside the town of Hobro, right at the end of Mariager Fjord.

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    The Fyrkat Viking Museum is an interactive open-air museum featuring a reconstructed Viking farmstead and several historically rebuilt longhouses. Here, you can learn how to bake Viking bread, a traditional flatbread that you can also taste. On specific days during the summer season, a variety of workshops and activities for children are offered, with re-enactors bringing ancient Viking-Age crafts and traditions back to life. The farm is located about one kilometre outside the Fyrkat ring fortress. Since 2023, the Fyrkat ring fortress, along with the other Danish ring fortresses, has held the official UNESCO World Heritage status.

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    The Møllergård Museum is part of the museum complex at the Fyrkat ring fortress. Just outside the walls of this Viking stronghold, archaeologists discovered in 1954 a burial ground containing thirty graves, including the grave of a woman believed to be a völva, a powerful Viking seeress. She wore rare jewellery and exotic clothing, indicating high status. Furthermore, several magical artefacts were found in her grave, including a wand, an amulet and a small silver box containing seeds of the poisonous henbane plant. The fascinating history of Fyrkat and the seeress from the Viking Age can be explored in a wing of the U-shaped Møllergård Museum.