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Holstein, former duchy, N central Germany, the part of Schleswig-Holstein S of the Eider River. Kiel and Rendsburg were the chief cities. For a description of Holstein and for its history after 1814, see Schleswig-Holstein. For a time part of the duchy of Saxony, Holstein was created (1111) a county of the Holy Roman Empire and was bestowed on Adolf of Schauenburg. In 1459, Holstein's Christian I, a Danish heir to the throne, established a personal union with Denmark, to the great displeasure of the German majority. In 1474, Emperor Frederick III raised Holstein to a duchy under the immediate suzerainty of the Holy Roman Empire (as distinct from Schleswig, which was outside the imperial jurisdiction).
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a region of N Germany, in S Schleswig-Holstein: in early times a German duchy of Saxony; became a duchy of Denmark in 1474; finally incorporated into Prussia in 1866
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005