Fornsigtuna (forn means ancient), Old Sigtuna, Sithun, Sign(h)ildsberg or Signesberg (59°37′N 17°39′E / 59.617°N 17.65°E / 59.617; 17.65) is located in the parish of Håtuna approximately 4 kilometres (2.5 mi) west of the modern town of Sigtuna, by lake Mälaren, in Sweden. Although the location is nearly forgotten, it has a central role in Norse mythology.
Read more about Fornsigtuna: Heimskringla, Skaldic Poetry, Gesta Danorum, Archaeology, History