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After escaping from the hands of Kunz von Kaufungen , who had abducted him together with his brother Ernest , he spent some time at the court of the emperor Frederick III in Vienna .
 Kunz von Kaufungen, Ernest, Frederick III, Vienna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Kunz von Kaufungen, Ernest, Frederick III, Vienna