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Ragnars saga is a sequel of sorts to the Völsunga saga , providing a link between the legendary figures of Sigurd and Brynhild and the historical events of the ninth to eleventh century , as well as prestige to the Norwegian royal house by portraying Sigurd as its ancestor .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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