_Baldwin II FLANDERS ___+
                                               | (0865 - 0918)          
                         _Arnulf I FLANDERS ___|
                        | (0890 - 0965)        |
                        |                      |_Ælfthryth of WESSEX __+
                        |                        (0877 - 0929)          
 _Baldwin III FLANDERS _|
| (0940 - 0962)         |
|                       |                       _Herbert II HERBERTIAN _+
|                       |                      | (0884 - 0942)          
|                       |_Adele of HERBERTIAN _|
|                         (0910 - 0960)        |
|                                              |_Adele of ROBERTIAN ____+
|                                                                       
|
|--Arnulf II FLANDERS 
|  (0961 - 0987)
|                                               _Billung of BILLUNG ____+
|                                              | (0880 - 0967)          
|                        _Hermann BILLUNG _____|
|                       | (0900 - 0973)        |
|                       |                      |_Ermangarde of NANTES __
|                       |                                               
|_Matilda of BILLUNG ___|
  (0935 - 1008)         |
                        |                       ________________________
                        |                      |                        
                        |_Oda of SAXONY _______|
                          (.... - 0972)        |
                                               |________________________