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In page Princess Adelheid of Anhalt-Bernburg-Schaumburg-Hoym:

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Adelheid married Duke Paul Frederick Augustus of Oldenburg on 24 July 1817 at Schaumburg Castle.[citation needed] The princess was just 17 years old when she married the 34-year-old duke. Duke Paul Frederick Augustus was the eldest son of Duke Peter of Oldenburg, heir to the Duchy of Oldenburg, and was thus second in line of succession after his father.