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His daughter , Adelheid of Vohburg , was the first wife of Frederick I , Holy Roman Emperor .
 Adelheid of Vohburg, Frederick I , Holy Roman Emperor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Adelheid of Vohburg, Frederick I , Holy Roman Emperor