question: How many years after the death of Waleran IV, Duke of Limburg did his daughter Ermengarde of Limburg die?
#1 return the  death of   Waleran IV ,  Duke of Limburg  
#2 return his daughter Ermengarde of   Limburg  die 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return difference of   #4 and  #3 in  years