_Heinrich I OLDENBURG ____+
                                               | (1125 - 1167)            
                       _Heinrich II OLDENBURG _|
                      | (1146 - 1198)          |
                      |                        |_Eilica of WERL-RIETBERG _
                      |                          (1103 - 1163)            
 _Burchard OLDENBURG _|
| (1175 - 1233)       |
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|--Heinrich IV OLDENBURG 
|  (1219 - 1270)
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