_Henry III WELF _______________+
                                             | (1129 - 1195)                 
                       _William WELF ________|
                      | (1184 - 1213)        |
                      |                      |_Matilda of PLANTAGENET _______+
                      |                        (1155 - 1189)                 
 _Otto I WELF ________|
| (1204 - 1252) m 1228|
|                     |                       _Valdemar I Knudsen ESTRIDSEN _+
|                     |                      | (1130 - 1182)                 
|                     |_Helena of ESTRIDSEN _|
|                       (1180 - 1233)        |
|                                            |_Sofia of POLOVTS _____________+
|                                              (1138 - 1198)                 
|
|--Albert I WELF 
|  (1236 - 1279)
|                                             _Otto I ASCANIA _______________+
|                                            | (1128 - 1184)                 
|                      _Albert II ASCANIA ___|
|                     | (1177 - 1219) m 1205 |
|                     |                      |_Ada of HOLLAND _______________+
|                     |                        (1163 - 1205)                 
|_Matilda of ASCANIA _|
  (1210 - 1261) m 1228|
                      |                       _Conrad II WETTIN _____________+
                      |                      | (1159 - 1210)                 
                      |_Matilda of WETTIN ___|
                        (1185 - 1225) m 1205 |
                                             |_Elizabeth of PIAST ___________+
                                               (1152 - 1209)