Jomsborg

Jomsborg (German: Jomsburg) was a semi-legendary Viking stronghold at the southern coast of the Baltic Sea (medieval Wendland, modern Pomerania), that existed between the 960s and 1043. Its inhabitants are known as Jomsvikings. Jomsborg's exact location has not yet been established, though it is maintained that Jomsborg was somewhere on the islands of the Oder estuary. Lauritz Weibull dismissed it as a legend.