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He was owned and bred by Edward Petre ( 1794 – 1848 ) , a free-spending sportsman and gambler , who was a younger son of Robert Petre , 9th Baron Petre .
 Petre, Robert Petre , 9th Baron Petre
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Petre, Robert Petre , 9th Baron Petre