_____________________
                                                               |                     
                       _, Burchard (of Avesnes) [-father of-] _|
                      |                                        |
                      |                                        |_____________________
                      |                                                              
 _Burchard ___________|
|                     |
|                     |                                         _____________________
|                     |                                        |                     
|                     |________________________________________|
|                                                              |
|                                                              |_____________________
|                                                                                    
|
|--John 
|  (.... - 1257)
|                                                               _Baldwin V __________+
|                                                              | (.... - 1195)       
|                      _Baldwin IX ____________________________|
|                     | (.... - 1205)                          |
|                     |                                        |_Margaret ___________
|                     |                                                              
|_Margaret I _________|
  (.... - 1280)       |
                      |                                         _____________________
                      |                                        |                     
                      |_Mary __________________________________|
                                                               |
                                                               |_____________________