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Prelude On September 29 , 1580 , Francis , Duke of Anjou ( younger brother of King Henry III of France ) , supported by William of Orange , signed the Treaty of Plessis-les-Tours with the States-General of the Netherlands .
 Francis , Duke of Anjou, Henry III of France, William of Orange, Netherlands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Francis , Duke of Anjou, Henry III of France, William of Orange, Netherlands