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As the new ruler of the Roman Empire , he vowed to restore liberties which had been curtailed during the autocratic government of Domitian .
 location: Roman Empire; person: Domitian
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Roman Empire, Domitian 
Answer:
 location: Roman Empire; person: Domitian