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He was for many years regarded as the author of the legendary Historia de vita Caroli Magni et Rolandi , and appears as one of the Twelve Peers in a number of the chansons de geste , the most important of which is La Chanson de Roland .
 Roland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Roland