_Albert II WELF _______+
                                                | (1268 - 1318)         
                         _Magnus I WELF ________|
                        | (1304 - 1369)         |
                        |                       |_Rixa of MECKLENBURG __+
                        |                         (1275 - 1317)         
 _Magnus II WELF _______|
| (1324 - 1373) m 1356  |
|                       |                        _Henry I ASCANIA ______+
|                       |                       | (1255 - 1317)         
|                       |_Sophia of ASCANIA ____|
|                         (1300 - 1356)         |
|                                               |_Agnes of WITTELSBACH _+
|                                                 (1276 - 1345)         
|
|--Frederick I WELF 
|  (1357 - 1400)
|                                                _Bernhard II ASCANIA __+
|                                               | (1260 - 1323)         
|                        _Bernhard III ASCANIA _|
|                       | (1300 - 1348) m 1328  |
|                       |                       |_Helen of VITSLAV _____+
|                       |                         (1270 - 1315)         
|_Catherine of ASCANIA _|
  (1330 - 1389) m 1356  |
                        |                        _Rudolf I ASCANIA _____+
                        |                       | (1284 - 1355) m 1298  
                        |_Agnes of ASCANIA _____|
                          (.... - 1337) m 1328  |
                                                |_Judith of ASCANIA ____+
                                                  (.... - 1328) m 1298