Verwandtschaft der Eheleute
 

                                           Magnus Herzog von Sachsen
                                           1043/47-23.8.1106

                                           oo 2. Sophia von Ungarn
                                                           -18.6.1106

                             ---------------------------------------------------------------------------------------
            Wulfhilde Billung von Sachsen                                                               Eilika Billung von Sachsen
            um 1071-29.12.1126                                                                             um 1081-16.1.1142

           oo Heinrich der Schwarze                                                                      oo Otto Graf von Ballenstedt
               um 1075-13.12.1126                                                                              um 1070/73-9.2.1123
 

                     ----                                                                                                     ---
               Heinrich der Stolze                                                                            Albrecht I. Markgraf von Brandenburg
               um 1108-20.10.1139                                                                         1100-18.11.1170

               oo Gertrud von Supplinburg                                                         oo Sophie von Winzenburg
                  8.4.1115-18.4.1143                                                                                -7.7.1160
 

                  ----                                                                                                       ----
              Heinrich der Löwe                                                                              Otto I. Markgraf von Brandenburg
             1129-6.8.1195                                                                                     1128-8.7.1184

             oo Mathilde von England                                                                      oo Judith von Polen
                 1155-28.6.1189                                                                                         - um 1174
 

                 -----                                                                                                        ----
            Wilhelm Graf von Lüneburg                                                                    Albrecht II. Markgraf von Brandenburg
            11.4.1184-12.12.1213                                                                             um 1150-25.2.1220

            oo Helena von Dänemark                                                                        oo Mathilde von der Lausitz
                       -22.11.1233                                                                                            -   1255
 

               -----                                                                                                          ----
           Otto I. das Kind                                                                                       Mechthild von Brandenburg
           1204-9.6.1252                                                                                         1210/15-10.6.1261