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According to the author Philippa Gregory , " The Other Queen has been a wonderful book to research and write – I have quite transformed my view of Mary Queen of Scots and to research Bess of Hardwick , her rival and gaoler , has been enormously interesting . "
 Philippa Gregory, Queen, Queen, Scots, Bess, Hardwick
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Philippa Gregory, Queen, Queen, Scots, Bess, Hardwick