_Otto I WELF __________________+
                                                           | (1204 - 1252) m 1228          
                        _Albert I WELF ____________________|
                       | (1236 - 1279)                     |
                       |                                   |_Matilda of ASCANIA ___________+
                       |                                     (1210 - 1261) m 1228          
 _Albert II WELF ______|
| (1268 - 1318)        |
|                      |                                    _______________________________
|                      |                                   |                               
|                      |_Adelheid of ALERAMICI ____________|
|                        (1242 - 1285)                     |
|                                                          |_______________________________
|                                                                                          
|
|--Richenza of WELF 
|  
|                                                           _Nicholas I MECKLENBURG _______+
|                                                          | (1210 - 1277) m 1232          
|                       _Henry I MECKLENBURG ______________|
|                      | (.... - 1291)                     |
|                      |                                   |_Judith of ASCANIA ____________+
|                      |                                     (.... - 1277) m 1232          
|_Rixa of MECKLENBURG _|
  (1275 - 1317)        |
                       |                                    _Birger Magnusson BJÄLBO _____+
                       |                                   | (1200 - 1266)                 
                       |_Rikissa Birgersdotter of BJÄLBO _|
                         (1237 - 1288)                     |
                                                           |_Ingeborg Eriksdotter of ERIC _+
                                                             (1212 - 1254)