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The tale covers the origin of Aslaug , Ragnar 's quest for the hand of Thora Town-Hart , his later marriage to Aslaug , the deeds of their sons ( and Aslaug ) in battle , and Ragnar 's death at the hands of king Ælla of Northumbria .
 Ragnar, Ragnar, Ælla of Northumbria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ragnar, Ragnar, Ælla of Northumbria