_Frederick I OLDENBURG ___________+
                                                 | (1471 - 1533) m 1502             
                       _Christian III OLDENBURG _|
                      | (1503 - 1558)            |
                      |                          |_Anna of HOHENZOLLERN ____________+
                      |                            (1487 - 1514) m 1502             
 _John II OLDENBURG __|
| (1545 - 1622)       |
|                     |                           _Magnus I ASCANIA ________________+
|                     |                          | (1469 - 1563)                    
|                     |_Dorothea of ASCANIA _____|
|                       (1511 - 1571)            |
|                                                |_Catherine of WELF _______________+
|                                                  (1488 - 1563)                    
|
|--August SCHLESWIG-HOLSTEIN-SONDERBURG 
|  
|                                                 _Philip I WELF ___________________+
|                                                | (1476 - 1551)                    
|                      _Ernest III WELF _________|
|                     | (1518 - 1567)            |
|                     |                          |_Catherine of MANSFELD-VORDERORT _
|                     |                            (1501 - 1535)                    
|_Elisabeth of WELF __|
  (1549 - 1585)       |
                      |                           __________________________________
                      |                          |                                  
                      |_Margaret of GRIFFINS ____|
                        (1518 - 1569)            |
                                                 |__________________________________