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In page Schleswig-Holstein:

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The Duchy of Schleswig, or Southern Jutland, was originally an integral part of Denmark, but in medieval times was established as a fief under the control of the Kingdom of Denmark, having the same relationship with the Danish Crown as, for example, Brandenburg or Bavaria had with the Holy Roman Emperor. Around 1100, the Duchy of Saxony gave Holstein to Count Adolf I of Schauenburg.[citation needed]