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The Imperial crown once held by the Carolingian emperors was disputed between their fractured heirs and local overlords ; none emerged victorious until Otto I , Holy Roman Emperor invaded Italy .
 Otto 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:
 Otto I , Holy Roman Emperor