The Marsh King's Daughter (page 54)
It’s all in HC Andersen, all in HC Andersen: Bless me, what do they teach them at these schools?
The Wikings had many a splendid city after their own fashion. South of the Kattegat, that dangerous portion of the Jutland Sea, from west to east along the Baltic you had Hedeby on the Slie, which the Germans called Haithabu, Heiðabýr in the old language, known to the Romans as Heidiba. Then there’s Reric on the Wismar Bay, not to be confused with Ol Gartz, also known as Rerik at the end of Salt Lagoon. Further east there is Arkona by the chalk cliffs and Ralswiek the safe harbour. Curving southward with the land you come to Menzlin by the Silver Hoard of Anklam, then in quick succession the jewels Vineta, Jomsborg, and Wolin.
Where there are wild Northmen, there will be ragna rökr, or Götterdämmerung. The old gods and their winged Valkyries and dead heroes will fall in the great battle to St. Ansgarius and St. Otto, who bring new gods to the North.
New gods and new priests, new schisms and new denominations, eventually Bonhoeffer in Zingst against the Nazis. These northern seas and northern lands, Götterdämmerung all over again.