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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 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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