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The County of Monzón was a marcher county of the Kingdom of León in the tenth and eleventh centuries , during a period of renewed external threat ( the Caliphate of Córdoba ) and disintegration of royal authority .
 Monzón, León, Caliphate of Córdoba
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Monzón, León, Caliphate of Córdoba