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When Ravenna was captured by the forces of Justinian II , Felix was taken to Constantinople , tried and blinded , and sent into exile .
 Ravenna, Justinian II, Felix, Constantinople
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ravenna, Justinian II, Felix, Constantinople