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The complex of a palace , church and barracks was erected in the mid-sixth century by the Byzantine Emperor Justinian I ( r. 527 – 565 ) as a part of a defensive line ( together with Resafa and Halabiye ) against the Sassanid Persia ns .
 Byzantine, Justinian I, Resafa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Byzantine, Justinian I, Resafa