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In 1527 he participated in the Sack of Rome , and personally escorted the besieged Pope Clement VII from his refuge in the Castel Sant ' Angelo to the town of Orvieto .
 Pope Clement VII, Orvieto
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pope Clement VII, Orvieto