_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)            |
|                                                |________________________________
|                                                                                 
|
|--Christian IV OLDENBURG 
|  (1287 - 1334)
|                                                 _Otto I WELF ___________________+
|                                                | (1204 - 1252) m 1228           
|                      _John WELF _______________|
|                     | (1242 - 1277)            |
|                     |                          |_Matilda of ASCANIA ____________+
|                     |                            (1210 - 1261) m 1228           
|_Elisabeth of WELF __|
  (1272 - 1294)       |
                      |                           ________________________________
                      |                          |                                
                      |_Liutgard of SCHAUENBURG _|
                        (.... - 1288)            |
                                                 |________________________________