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In August of that year , her half-brother , King Henry married her to John de Warenne , 6th Earl of Surrey ( August 1231 - 29 September 1304 ) .
 Warenne, 6th Earl, Surrey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Warenne, 6th Earl, Surrey