_Dietrich OLDENBURG ____+
                                                     | (1398 - 1439)          
                          _Christian VI OLDENBURG ___|
                         | (1425 - 1481) m 1449      |
                         |                           |_Helvig of SCHAUENBURG _
                         |                             (1398 - 1436)          
 _Frederick I OLDENBURG _|
| (1471 - 1533) m 1518   |
|                        |                            _John HOHENZOLLERN _____
|                        |                           | (1406 - 1464)          
|                        |_Dorothea of HOHENZOLLERN _|
|                          (1430 - 1495) m 1449      |
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|--John II OLDENBURG 
|  (1521 - 1580)
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|_Sophie of GRIFFINS ____|
  (1498 - 1568) m 1518   |
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