Nordborg Castle: A Medieval Fortress and Historicist Castle in Denmark
Site at a Glance
- Rating
- 4.3
- Popularity
- Low
- Country
- Denmark
- Primary era
- Modern
- Eras represented
- Medieval, Early Modern, Modern
- Civilizations
- Danish, German
- Site type
- Military
- Remains
- Castle
On this page7 sections
History
Nordborg Castle is a medieval Danish fortress and later residence in Denmark, originating in the twelfth century as Alsborg and now presenting a largely German Historicist appearance. Its inland position on the island of Als provided warning of attacks by the Wends, West Slavic peoples associated with the southern Baltic coast, and offered refuge to the local population. Nordborg is among the oldest castle complexes in Denmark.
Alsborg and the medieval Danish Crown
Tradition recorded by the medieval historian Saxo Grammaticus attributes the foundation of Alsborg to King Svend Grathe around 1150, during the period of Danish succession conflicts and Wendish incursions along the coast. The first written evidence for the fortress dates from the late twelfth century. Bishop Valdemar of Slesvig was imprisoned there between 1192 and 1197.
After Sønderborg Castle was built around 1158 at the southern end of Als, Alsborg became known as Nordborg, meaning “northern fortress.” For much of the Middle Ages, it belonged to the Danish Crown and was sometimes assigned to a king’s widow as a source of income. King Erik V was temporarily held at the castle in the thirteenth century. In 1358, King Valdemar IV captured Nordborg during his campaigns of expansion, and Queen Margaret I stayed there in 1412 before her final journey to Schleswig.
The ducal estate and seventeenth-century wars
During the mid-sixteenth century, Nordborg passed to Hans the Younger, the brother of King Frederick II and heir to Queen Dorothea’s possessions on Als and Sundeved. Over the next fifty years, Hans expanded and improved the estate through numerous building projects at and around the castle.
After Hans the Younger died in 1622, Nordborg became part of a separate duchy inherited by his son Hans Adolf. Hans Adolf died in 1624, and the duchy then passed to his younger brother Frederik. During the seventeenth century, Nordborg served as the seat of the Schleswig-Holstein-Sonderburg-Norburg part-duchy, a small hereditary territory governed by a branch of the Schleswig-Holstein-Sonderburg ruling house.
The Swedish wars brought repeated military occupation and damage. Swedish forces, Brandenburgian and Polish troops, and Swedish forces again successively occupied Nordborg before peace was restored in 1660. A fire destroyed the castle in 1665. Following Duke Hans Bugislav’s bankruptcy, the ruins passed through an exchange in 1676 to the House of Schleswig-Holstein-Plön.
Reconstruction, decline, and renewed use
Reconstruction began in 1678, when a ducal coat of arms was placed above the entrance. A rural Baroque castle stood on the ruins by 1688. The chapel was probably equipped in 1693, at the initiative of August of Schleswig-Holstein-Norburg-Plön, with a small six-register organ made by the Hamburg organ builder Arp Schnitger. A register was a selectable set of organ pipes producing a particular tone, so the instrument had six such stops. By 1747, the organ was described as deteriorated.
By 1730, the castle and its lands had returned to the Danish Crown. The roughly 400-hectare estate was gradually divided into farms, and the castle was sold to a private owner in 1766. Several buildings were demolished and sold as building material, while the remaining complex deteriorated for about 140 years.
Nordborg town purchased the castle in 1909. Mayor Klinkers promoted its conversion into a German-language high school intended to counter Danish high schools north of the border. Following restoration, the castle was leased in 1910 to the German high-school association in Northern Schleswig.
After Northern Schleswig was reunited with Denmark in 1920, the merchant Johan Hansen bought Nordborg Castle in 1921 and established the Nordborg Slot Foundation. Since 1922, the foundation has operated Nordborg Slots Efterskole, a Danish residential continuation school for older adolescents, at the castle. The premises continue to serve the boarding school and have also hosted the Nord-Als Music Festival for several years.
Remains
Nordborg Castle stands on a castle island in Nordborg Lake on Als. The surviving complex is an angular, two-wing building in the German Historicist style, an approach that revived and combined forms from earlier architectural periods. Older components are incorporated into the present structure, whose external appearance derives largely from reconstruction during the period of Prussian administration and restoration by the architect Eugen Fink.
Castle buildings and entrance
The approach to the castle island is marked by a gatehouse with towers. Within the complex, the principal two-wing building is accompanied by a rectangular former economic wing and several ancillary buildings. The ducal coat of arms installed above the entrance during the rebuilding begun in 1678 remains part of the castle’s architectural history. The surviving buildings form a reduced complex compared with the earlier estate, after former castle structures were demolished following the 1766 sale.
Castle island and former park
An avenue survives from the Baroque castle park on the island. The garden area has since been adapted to the requirements of the boarding school, while the island setting in Nordborg Lake remains part of the castle’s physical arrangement.
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