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Nothing is known for certain about his work beyond Pliny 's remark , but it may have resembled fragmentary caryatids recovered from the Forum of Augustus and Hadrian 's Villa .
 Pliny, Augustus, Hadrian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pliny, Augustus, Hadrian