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Germany. Kaiser Wilhelm I. Father of Friederick III of Prussia.
Princess Margaret of Prussia (Margarete Beatrice Feodora) (22 April 1872 – 22 January 1954) was a daughter of Frederick III, German Emperor and Victoria, Princess Royal (of Great Britain). She married Prince Frederick Charles of Hesse. In 1926 they became Landgrave and Landgravine of Hesse. She lost three sons in the two World Wars.