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He was born in St Petersburg , Russia , the son of the 6th Viscount Strangford , the British Ambassador .
 St Petersburg, Russia, 6th Viscount Strangford
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, Russia, 6th Viscount Strangford