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The oldest written proof of the name 's occurrence in Sweden was Ingrid Ylva , the mother of Birger Magnusson von Bjälbo from about 1200 .
 Ingrid Ylva, Birger Magnusson von Bjälbo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ingrid Ylva, Birger Magnusson von Bjälbo