_William III of BÉTHUNE _+
                                                   | (.... - 1243)            
                          _William IV of BÉTHUNE _|
                         | (.... - 1255)           |
                         |                         |_Elizabeth of ROESBRUGGE _
                         |                                                    
 _William V of BÉTHUNE _|
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|--William VI of BÉTHUNE 
|  (.... - 1340)
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