_Henry WELF ____________+
                                                    | (1468 - 1531)          
                          _Ernest I WELF ___________|
                         | (1497 - 1545)            |
                         |                          |_Margarete of WETTIN ___+
                         |                            (1469 - 1528)          
 _William VI WELF _______|
| (1535 - 1592) m 1561   |
|                        |                           _Henry V MECKLENBURG ___+
|                        |                          | (1479 - 1551) m 1551   
|                        |_Sophia of MECKLENBURG ___|
|                          (1508 - 1541)            |
|                                                   |_Ursula of ASCANIA _____+
|                                                     (1523 - 1577) m 1551   
|
|--John WELF 
|  (1583 - 1628)
|                                                    _Frederick I OLDENBURG _+
|                                                   | (1471 - 1533) m 1502   
|                         _Christian III OLDENBURG _|
|                        | (1503 - 1558)            |
|                        |                          |_Anna of HOHENZOLLERN __+
|                        |                            (1487 - 1514) m 1502   
|_Dorothea of OLDENBURG _|
  (1546 - 1616) m 1561   |
                         |                           _Magnus I ASCANIA ______+
                         |                          | (1469 - 1563)          
                         |_Dorothea of ASCANIA _____|
                           (1511 - 1571)            |
                                                    |_Catherine of WELF _____+
                                                      (1488 - 1563)