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Theodor Gottlieb Hippel , from 1790 von Hippel ( 13 December 1775 in Gerdauen ( now Zheleznodorozhny ) – 10 June 1843 in Bromberg ) was a Prussian statesman , the friend of E. T. A. Hoffmann , and the author of Frederick William III 's proclamation An Mein Volk ( 1813 ) .
 Theodor Gottlieb Hippel, von Hippel, Bromberg, E. T. A. Hoffmann, Frederick William III
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Theodor Gottlieb Hippel, von Hippel, Bromberg, E. T. A. Hoffmann, Frederick William III