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The eparch continued to govern Thessalonica until the early 9th century , when he was replaced by a strategos at the head of the new theme of Thessalonica .
 Thessalonica, Thessalonica
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thessalonica, Thessalonica