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The urban continuity of Constantinople is the outstanding example of the Mediterranean world ; of the two great cities of lesser rank , Antioch was devastated by the Persian sack of 540 , followed by the plague of Justinian ( 542 onwards ) and completed by earthquake , while Alexandria survived its Islamic transformation , to suffer incremental decline in favour of Cairo in the medieval period .
 Constantinople, Antioch, Justinian, Alexandria, Cairo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Constantinople, Antioch, Justinian, Alexandria, Cairo