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He married Trajan 's grand-niece Vibia Sabina early in his career , before Trajan became emperor and possibly at the behest of Trajan 's wife Pompeia Plotina .
 Trajan, Vibia Sabina, Trajan, Trajan, Pompeia Plotina
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, Vibia Sabina, Trajan, Trajan, Pompeia Plotina