_Robert IV of BÉTHUNE _+
                                                  | (.... - 1128)          
                          _William I of BÉTHUNE _|
                         | (.... - 1138)          |
                         |                        |________________________
                         |                                                 
 _Robert V of BÉTHUNE __|
|                        |
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|                                                                          
|
|--William II of BÉTHUNE 
|  (.... - 1214)
|                                                  ________________________
|                                                 |                        
|                         ________________________|
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|                        |                                                 
|_Adelaide of SAINT-POL _|
                         |
                         |                         ________________________
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                         |________________________|
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