Christian is a great-grandson of the last Grand Duke of Oldenburg, Frederick Augustus II and through his mother he is related to the Princes of Löwenstein-Wertheim-Freudenberg, who belong to a morganatic branch of the House of Wittelsbach descending from Frederick I, Elector Palatine.
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Christian married Countess Caroline of Rantzau (b. 1962) at Pronstorf on 26 September 1987.
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Duke Christian was born in Rastede, Lower Saxony, the only son of Duke Anton-Günther of Oldenburg and his wife Princess Ameli of Löwenstein-Wertheim-Freudenberg (b. 1923).
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Duke Christian Nikolaus Udo Peter of Oldenburg (born 1 February 1955 in Rastede), married to Countess Caroline zu Rantzau and has issue