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Life He was sent twice as a papal envoy to Constantinople , in 525 , by Pope John I and in 536 to accompany Pope Agapitus I , who lost his life on the journey , to defend the true faith against the Monophysite heresy .
 Constantinople, Pope John I, Pope Agapitus 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:
 Constantinople, Pope John I, Pope Agapitus I