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In 1810 he became an employee of the State Chancellor Karl August von Hardenberg , and the next year joined the State Council , where he wrote the famous proclamation An Mein Volk , in which for the first time a Prussian monarch directly addressed his subjects to explain his policies .
 person: Karl August von Hardenberg
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Karl August von Hardenberg 
Answer:
 person: Karl August von Hardenberg