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The first such recorded example of a non-Muslim entering the city is that of Ludovico di Varthema of Bologna in 1503 .
 Ludovico di Varthema, Bologna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ludovico di Varthema, Bologna