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Initially it was a small duchy established in the 12th century east of the Rhine River but over time the area grew in importance especially during the Middle Ages as several cities in the Westphalian region such as Münster and Osnabrück prospered as members of the Hanseatic League.
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Westphalia does not exist
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Westphalia gains cores on Magdeburg (52), Lüneburg (53), Stade (54), Osnabrück (56), Brunswick (57), Hessen (81), Westfalen (82), Nassau (83) and Münster (86).