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Promoted to Brigadier General at the end of 1805 , he was given an important mission to St Petersburg by Napoleon , where he was accompanied by his great friend Claude Testot-Ferry , later a colonel in the cavalry of the Imperial Guard .
 St Petersburg, Napoleon, Claude Testot-Ferry
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 St Petersburg, Napoleon, Claude Testot-Ferry