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Plot Raoul de Cambrai , the posthumous son of Raoul Taillefer , count of Cambrai , by his wife Alais , sister of King Louis d'Outre-Mer , whose father 's lands had been given to another , demanded the fief of Vermandois , which was the natural inheritance of the four sons of Herbert , lord of Vermandois .
 Cambrai, Cambrai, Louis d'Outre-Mer, Vermandois, Herbert , lord of Vermandois
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cambrai, Cambrai, Louis d'Outre-Mer, Vermandois, Herbert , lord of Vermandois