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With the loss of most of the Balkan hinterland to the Slavic invasions in the 7th century , however , the authority of the prefect ( in Greek eparchos , " eparch " ) was largely confined to the city and its immediate surroundings .
 None
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:  
Answer:
 None