Troldborg Ring

The Troldborg Ring is an Iron Age fortification in Vejle Municipality in Denmark, 13 km west of the city of Vejle [1]. It is located at a natural spring on a high point overlooking the Vejle River Valley [1]. The surrounding area is a steep ravine known as the Devil's Valley [1]. The site consists of a raised area of about 1,700 m2 surrounded by a circular rampart [1]. One side is protected by a steep drop of 70 m to the valley floor, while the other side features a 0.5-metre-deep, 2.5-metre-wide moat [1]. The Troldborg Ring was built around the years 100-200 during a period of turbulence in Denmark, and it was used until around the year 400 [1]. It likely served as a refuge during times of violence rather than a permanent dwelling [1]. A considerable amount of ash from massive fires has been found at the site, although the source and timing of these fires is unclear [1].