_Hermann BILLUNG ____+
                                                  | (0900 - 0973)       
                          _Bernard I BILLUNG _____|
                         | (0950 - 1010)          |
                         |                        |_Oda of SAXONY ______
                         |                          (.... - 0972)       
 _Bernard II BILLUNG ____|
| (0995 - 1059)          |
|                        |                         _____________________
|                        |                        |                     
|                        |_Hildegarde of STADE ___|
|                                                 |
|                                                 |_____________________
|                                                                       
|
|--Gertrude of BILLUNG 
|  (1030 - 1113)
|                                                  _____________________
|                                                 |                     
|                         _Henry SCHWEINFURT _____|
|                        | (0970 - 1017)          |
|                        |                        |_____________________
|                        |                                              
|_Eilika of SCHWEINFURT _|
  (1005 - 1059)          |
                         |                         _Herbert CONRADINE __+
                         |                        | (0930 - 0992)       
                         |_Gerberga of CONRADINE _|
                           (0970 - 1036)          |
                                                  |_Irmtrud of AVALGAU _
                                                    (0957 - 1020)