_John I MECKLENBURG __________________+
                                                | (1211 - 1264) m 1229                 
                         _Henry I MECKLENBURG __|
                        | (1230 - 1301) m 1259  |
                        |                       |_Luitgard of HENNEBERG _______________+
                        |                         (1210 - 1267) m 1229                 
 _Henry II MECKLENBURG _|
| (1266 - 1328)         |
|                       |                        _Barnim I GRIFFIN ____________________+
|                       |                       | (1217 - 1278) m 1238                 
|                       |_Anastasia of GRIFFIN _|
|                         (1245 - 1316) m 1259  |
|                                               |_Marianne of WELF ____________________+
|                                                 (.... - 1252) m 1238                 
|
|--Matilda of MECKLENBURG 
|  (1293 - 1357)
|                                                _Otto III ASCANIA ____________________+
|                                               | (1215 - 1267)                        
|                        _Albert III ASCANIA ___|
|                       | (1250 - 1300)         |
|                       |                       |_Beatrice of PŘEMYSLID ______________+
|                       |                         (1225 - 1290)                        
|_Beatrix of ASCANIA ___|
  (.... - 1314)         |
                        |                        _Christopher I Valdemarsen ESTRIDSEN _+
                        |                       | (1219 - 1259)                        
                        |_Matilda of ESTRIDSEN _|
                          (1250 - 1299)         |
                                                |_Margaret of SOBIESLAW _______________
                                                  (1230 - 1282)