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So Wilhelm I was the first Emperor of a unified Germany. He was married to Augusta of Sax-Weimar, but whom he had a son, Frederick III, and a daughter Louise, Grand Duchess of Baden. Their relationship was very cold, one of the reasons being that Wilhelm was in love with another woman when he was forced to marry Augusta. That woman was Princess Elisa Radziwill. They were not allowed to marry because Elisa did not have sufficiently high nobility to marry the heir to the Prussian throne (Elisa was not royal, because her father was not a reigning prince). There were several plans for her to be adopted by Emperor Alexander I of Russia or by Wilhelm's uncle Prince Augustus of Prussia but nothing came of it. So what if Wilhelm and Elisa were allowed to marry? Would this change anything or not?http://en.wikipedia.org/wiki/Elisa_Radziwill#cite_note-1