_John I OLDENBURG ______________+
                                                 | (1204 - 1270)                  
                       _Christian III OLDENBURG _|
                      | (1245 - 1285)            |
                      |                          |_Richeza of HOYA-STUMPENHAUSEN _
                      |                            (1220 - 1270)                  
 _John II OLDENBURG __|
| (1260 - 1314)       |
|                     |                           _Heinrich IV OLDENBURG _________+
|                     |                          | (1219 - 1270)                  
|                     |_Hedwig of WILDESHAUSEN __|
|                       (1233 - 1314)            |
|                                                |________________________________
|                                                                                 
|
|--John III OLDENBURG 
|  (1306 - ....)
|                                                 ________________________________
|                                                |                                
|                      __________________________|
|                     |                          |
|                     |                          |________________________________
|                     |                                                           
|_Hedwig of DIEPHOTZ _|
  (1264 - 1307)       |
                      |                           ________________________________
                      |                          |                                
                      |__________________________|
                                                 |
                                                 |________________________________