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Later , western emperors ruled from Milan or Ravenna , or cities in Gaul .
 organization: western emperors; location: Milan; location: Ravenna; location: Gaul
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: western emperors; location: Milan; location: Ravenna; location: Gaul