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He joined the Crusade of 1197 and on his return petitioned Pope Innocent III to formally approve the Teutonic Knights in 1199 .
 Pope Innocent III, Teutonic Knights
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 Innocent III, Teutonic Knights