_Valdemar I Knudsen ESTRIDSEN _+
                                                                | (1130 - 1182)                 
                                        _Valdemar II ESTRIDSEN _|
                                       | (1170 - 1241)          |
                                       |                        |_Sofia of POLOVTS _____________+
                                       |                          (1138 - 1198)                 
 _Christopher I Valdemarsen ESTRIDSEN _|
| (1219 - 1259)                        |
|                                      |                         _Sancho I BURGUNDY ____________+
|                                      |                        | (1154 - 1211)                 
|                                      |_Berengaria BURGUNDY ___|
|                                        (1198 - 1221)          |
|                                                               |_Dulce of BARCELONA ___________+
|                                                                 (1160 - 1198)                 
|
|--Niels ESTRIDSEN 
|  (.... - 1259)
|                                                                _______________________________
|                                                               |                               
|                                       ________________________|
|                                      |                        |
|                                      |                        |_______________________________
|                                      |                                                        
|_Margaret of SOBIESLAW _______________|
  (1230 - 1282)                        |
                                       |                         _______________________________
                                       |                        |                               
                                       |________________________|
                                                                |
                                                                |_______________________________