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In 1802, he accepted the situation of counsellor to the newly erected court of appeal at Hadamar, an office which he filled at Düsseldorf, during the disturbances of Nassau; but being recalled, in 1811, to the service of the duke of Nassau, he became vice-director of the aulic tribunal of Wiesbaden, and referendary of the minister of state.
By German Mediatisation, the county Dietz and its dependencies, and the Lordships Wehrheim and Burbach, all came under the sovereignty of the Duke of Nassau-Usingen and the Prince of Nassau-Weilburg.
On 9 January 1816, he succeeded his father, Duke Frederick William, as the Prince of Nassau-Weilburg and joint Duke of Nassau with his cousin, Frederick Augustus, of the Nassau-Usingen branch of his family.
Adolphe, Grand Duke of Luxembourg (1817–1905), Duke of Nassau and later Grand Duke of Luxembourg
1816: Wilhelm, Prince of Nassau-Weilburg and Duke of Nassau — Nassau-Weilburg merged into Duchy of Nassau
Princess Henriëtte van Nassau-Weilburg, then van Nassau (Kirchheimbolanden, 22 April 1780 – Kirchheim unter Teck, 2 January 1857) was a daughter of Prince Charles Christian, Duke of Nassau-Weilburg and Carolina of Orange-Nassau, daughter of William IV, Prince of Orange.
Wilhelm, Duke of Nassau, Prince of Nassau-Weilburg (Given names: Georg Wilhelm August Heinrich Belgicus zu Nassau-Weilburg/zu Nassau) (14 June 1792, Kirchheimbolanden – 20 August/30 August 1839, Bad Kissingen) was the father of Adolphe, Grand Duke of Luxembourg and Queen Sophia (consort of King of Oscar II of Sweden).