Trelleborg (Trælleborg)
Trelleborg (Trælleborg), located west of Slagelse on the Danish island of Zealand, is one of the seven known Viking ring castles.
When it was constructed, the fortress was strategically positioned on a peninsula that extended into a swampy area between two rivers. This swamp was connected to the Great Belt by a lake, allowing navigation by Viking ships.
Trelleborg is believed to have been commissioned by King Harald Bluetooth around 980 AD. It likely served to control the Great Belt and its sea traffic between the islands of Zealand and Funen, highlighting its importance in Viking maritime strategy and defense.
The site remains a significant archaeological and historical landmark, reflecting the ingenuity and military prowess of the Viking Age.
