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On the other hand , an aristocratic or " courtly " provenance has been taught , notably by Martín de Riquer , on the basis of the references to Peter , Count of Ribagorza , to people and places in the County of Roussillon and the Kingdom of Majorca , and evidence of Goliard ic influence .
 Martín de Riquer, County of Roussillon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Martín de Riquer, County of Roussillon