_John I OLDENBURG ___________________+ | (1204 - 1270) _Christian III OLDENBURG _| | (1245 - 1285) | | |_Richeza of HOYA-STUMPENHAUSEN ______ | (1220 - 1270) _John II OLDENBURG __| | (1260 - 1314) | | | _Heinrich IV OLDENBURG-WILDESHAUSEN _+ | | | (1219 - 1270) | |_Hedwig of WILDESHAUSEN __| | (1233 - 1314) | | |_____________________________________ | | |--Gisela of OLDENBURG | (1304 - 1350) | _____________________________________ | | | __________________________| | | | | | |_____________________________________ | | |_Hedwig of DIEPHOLZ _| (1264 - 1307) | | _____________________________________ | | |__________________________| | |_____________________________________