_Arnulf HOLLAND __________+
                                                | (0950 - 0993)            
                        _Dirk III HOLLAND ______|
                       | (0982 - 1039)          |
                       |                        |_Lutgardis of LUXEMBOURG _+
                       |                          (0955 - 1005)            
 _Floris I HOLLAND ____|
| (1017 - 1061)        |
|                      |                         _Bernard I BILLUNG _______+
|                      |                        | (0950 - 1010)            
|                      |_Othelindis of BILLUNG _|
|                        (.... - 1043)          |
|                                               |_Hildegarde of STADE _____
|                                                                          
|
|--Bertha of HOLLAND 
|  (1055 - 1094)
|                                                _Bernard I BILLUNG _______+
|                                               | (0950 - 1010)            
|                       _Bernard II BILLUNG ____|
|                      | (0995 - 1059)          |
|                      |                        |_Hildegarde of STADE _____
|                      |                                                   
|_Gertrude of BILLUNG _|
  (1030 - 1113)        |
                       |                         _Henry SCHWEINFURT _______
                       |                        | (0970 - 1017)            
                       |_Eilika of SCHWEINFURT _|
                         (1005 - 1059)          |
                                                |_Gerberga of CONRADINE ___+
                                                  (0970 - 1036)