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Christianity spread to Aramaic-speaking peoples along the Mediterranean coast and also to the inland parts of the Roman Empire and beyond that into the Parthian Empire and the later Sasanian Empire , including Mesopotamia , which was dominated at different times and to varying extents by these empires .
 Roman Empire, Mesopotamia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Roman Empire, Mesopotamia