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Titus Flavius Petro ( fl 1st century BC ) was the paternal grandfather of the Roman Emperor Vespasian .
 Titus Flavius Petro, Vespasian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Titus Flavius Petro, Vespasian