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During the generation following Chrétien de Troyes , about 40 of Arthur 's knights had attributed coats of arms ( Pastoreau 1997a , 259 ) .
 person: Chrétien de Troyes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Chrétien de Troyes