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On the other hand , some historians have speculated that Charlemagne opposed formal marriages for his daughters out of concern for political rivalries from their potential husbands ; none of Charlemagne 's daughters were married , despite political offers of arranged marriages .
 Charlemagne, Charlemagne
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Charlemagne, Charlemagne