Ragnhildsholmen

 castle ruins, archaeological site, historic ruins

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A ruined castle on the site of the medieval town of Konghelle (Norse) or Kungahälla (Swedish). It hosted a congress of all three Scandinavian kings in 1101, and later served as the residence of the Crusader King Sigurd I of Norway. The town was sacked by the Pomeranians in 1135. In 1256, King Håkon IV Håkonsson of Norway built the Ragnhildsholmen castle by the town. Later, in 1304, King Håkon V Mangusson of Norway turned it over to his son-in-law, the Swedish Duke Erik Magnusson, before the two quarreled over its possession. Eclipsed by the Bohus Castle after 1308, Ragnhildsholmen declined in strategic importance, and was finally abandoned after being damaged by a fire in 1612. The town itself was relocated northwards to the environs of the Bohus Castle and became modern Kungälv.