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During the Franco-German war , Freppel organized a body of priests to minister to the French prisoners in Germany , and penned an eloquent protest to the emperor William I .
 Freppel, emperor William I
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Freppel, emperor William I