_William I (III) Towhead _+
                                                            | (0915 - 0963) m 0935     
                                _William II (IV) 'Ironarm' _|
                               | (0937 - 0995) m 0968       |
                               |                            |_Adele ___________________+
                               |                              (0917 - 0962) m 0935     
 _William III (V) 'the Great' _|
| (0969 - 1030) m 1011         |
|                              |                             _Theobald I ______________+
|                              |                            | (0915 - 0975) m 0945     
|                              |_Emma ______________________|
|                                (0950 - 1003) m 0968       |
|                                                           |_Luitgarda _______________+
|                                                             (0915 - 0978) m 0945     
|
|--Theobald 
|  (1015 - ....)
|                                                            __________________________
|                                                           |                          
|                               ____________________________|
|                              |                            |
|                              |                            |__________________________
|                              |                                                       
|_Sancha von Gascogne _________|
   m 1011                      |
                               |                             __________________________
                               |                            |                          
                               |____________________________|
                                                            |
                                                            |__________________________