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All of this is presented in the context of the supposedly imminent end of the world - even though this is not in fact mentioned - a conviction that sparked numerous collections of end-time prophecies at the time , including an unpublished collection by Christopher Columbus .
 Christopher Columbus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Christopher Columbus