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The Theme of Thessalonica ( ) was a military-civilian province ( thema or theme ) of the Byzantine Empire located in the southern Balkans , comprising varying parts of Central and Western Macedonia and centred around Thessalonica , the Empire 's second-most important city .
 Thessalonica, Byzantine Empire, Balkans, Central, Western Macedonia, Thessalonica, Empire
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, Byzantine Empire, Balkans, Central, Western Macedonia, Thessalonica, Empire