_William I of BÉTHUNE _+
                                                    | (.... - 1138)          
                            _Robert V of BÉTHUNE __|
                           |                        |
                           |                        |________________________
                           |                                                 
 _William II of BÉTHUNE __|
| (.... - 1214) m 1190     |
|                          |                         ________________________
|                          |                        |                        
|                          |_Adelaide of SAINT-POL _|
|                                                   |
|                                                   |________________________
|                                                                            
|
|--William III of BÉTHUNE 
|  (.... - 1243)
|                                                    ________________________
|                                                   |                        
|                           ________________________|
|                          |                        |
|                          |                        |________________________
|                          |                                                 
|_Mathilda of DENDERMONDE _|
  (.... - 1224) m 1190     |
                           |                         ________________________
                           |                        |                        
                           |________________________|
                                                    |
                                                    |________________________