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A part of the site , Basilica of St. John , was built in the 6th century AD , under emperor Justinian I , over the supposed site of the apostle 's tomb .
 Basilica of St. John, Justinian I
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Basilica of St. John, Justinian I