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Then as a serving Legatus , Trebonius Gallus was a general under the command of the Roman Emperor Otho with Vestricius Spurinna in his expedition against the troops of Vitellius in Northern Italy .
 Trebonius Gallus, Otho, Vitellius, Italy
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, Vitellius, Italy