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The short story De Doop deals with the conversion of emperor Constantine the Great to Christianity , while De Gladiator takes place in the gladiator school in Ravenna .
 Constantine the Great, Ravenna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Constantine the Great, Ravenna