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In the year 69 Trebonius Gallus , became an ally to Otho and helped him to assassinate the then Roman Emperor Galba .
 Trebonius Gallus, Otho, Galba
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Trebonius Gallus, Otho, Galba