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Leadership in the Fourth Crusade At the Tournament at Écry-sur-Aisne on 28 November 1199 , Louis and his cousin Theobald III of Champagne were the first major nobles to respond to Pope Innocent III 's call for a Fourth Crusade .
 Louis, Theobald III of Champagne, Pope Innocent III
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Louis, Theobald III of Champagne, Pope Innocent III