page_title: Viking ring fortress
hierarchical_section_title: Viking ring fortress
caption_attribution_description: English: Trelleborg
context_page_description: A Viking ring fortress, or Trelleborg-type fortress, is a type of circular fort of a special design, built in Scandinavia in the Viking Age. They are also known simply as trelleborgs. All trelleborgs have a strictly circular shape, with roads and gates pointing in the four cardinal directions. These common structures are sometimes partially encircled by advanced ramparts, but these additions are not always circular.
  There are a total of seven known Viking ring fortresses at present, located in Denmark and Scania, Sweden. Most of them have been dated to the reign of the Harold Bluetooth of Denmark. The fort in Borgeby has been dated to around 1000 AD, so it is possible that it too, was built by the same king.
  Denmark and Sweden are currently applying for admission of the Viking ring fortresses as UNESCO World Heritage sites.
context_section_description: A Viking ring fortress, or Trelleborg-type fortress, is a type of circular fort of a special design, built in Scandinavia in the Viking Age. They are also known simply as trelleborgs.  All trelleborgs have a strictly circular shape, with roads and gates pointing in the four cardinal directions. These common structures are sometimes partially encircled by advanced ramparts, but these additions are not always circular.
  There are a total of seven known Viking ring fortresses at present, located in Denmark and Scania, Sweden. Most of them have been dated to the reign of the Harold Bluetooth of Denmark (died 986). The fort in Borgeby has been dated to around 1000 AD, so it is possible that it too, was built by the same king.
  Denmark and Sweden are currently applying for admission of the Viking ring fortresses as UNESCO World Heritage sites.
caption: Aerial view of the Viking ring fortress of Trelleborg, near Slagelse in Denmark. This was the first rediscovered Viking ring fortress, and the geometry is clearly visible.
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