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He visited Saint Petersburg at the call of the empress Elizabeth , and on his return was named in 1781 director of the French Academy in Rome , a position he kept until 1787 .
 Saint Petersburg, empress Elizabeth, French Academy in Rome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Saint Petersburg, empress Elizabeth, French Academy in Rome