He was a son of
Maurice I of Oldenburg (died 1211) and his wife Salome of Wickerode. After his father's death, he ruled jointly with his brother
Otto I. They ruled harmoniously and managed significantly to expand the rights and territory of Oldenburg in Frisia. Christian II managed to end the sovereignty of the
Archbishopric of Bremen over Oldenburg; in return, he assisted Bremen against the rebellious farmers in
Stedingen. He also fought many
feuds against his
liege lords, against his cousins, and against
Hoya. == Marriage and issue ==