┌─John I Count of Oldenburg
┌─Christian III Count of Oldenburg
│ └─Richeza of Hoya-Stumpenhausen
┌─John II Count of Oldenburg
│ │ ┌─Heinrich IV Count of Wildeshausen
│ └─Hedwig of Oldenburg-Wildeshausen
│ └─Elisabeth of Tecklenburg
Conrad I Count of Oldenburg
│ ┌─Conrad Count of Diepholz
└─Hedwige of Diepholz
└─Hedwig of Rietberg