A Viking ring fortress, Trelleborg-type fortress, or trelleborg, is a type of circular fort of a special design, built in Scandinavia during the Viking Age. These fortresses have a strictly circular s
Aerial view of the Viking ring fortress of Trelleborg, near Slagelse in Denmark. This was the first discovered Viking ring fortress, and the geometry is clearly visible.
Aerial view of the Viking ring fortress of Aggersborg. The similarity in design with Trelleborg near Slagelse, is clearly evident.
Recreation of a typical building at Fyrkat
Harald "Bluetooth" Gormsson was a king of Denmark and Norway.
Harald being baptized by Poppo the monk, in a relief dated to c. 1200
The larger Jelling stone, showing the inscription concerning Harald