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He and his sister became wards of Trajan and Publius Acilius Attianus ( who later became Trajan 's Praetorian prefect ) .
 Trajan, Publius Acilius Attianus, Trajan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Trajan, Publius Acilius Attianus, Trajan