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In page Schleswig, Schleswig-Holstein:

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The Viking settlement of Hedeby, located south of the modern town, was first mentioned in 804. It was a powerful settlement in the Baltic region, dominating the area for more than 200 years. In 1050, following several destructions, the population was moved to the opposite shore of the Schlei, becoming the city of Schleswig. In 1066 Hedeby was finally destroyed, and Schleswig remained a part of the Danish kingdom.[citation needed]