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In Frankfurt-am-Main on 9 February 1792 Augustus Christian Frederick married Fredericka (b. Usingen, 30 August 1777 - d. Hochheim, 28 August 1821), daughter of Frederick Augustus, Prince of Nassau-Usingen and later (1806) Duke of Nassau.
Under pressure from Napoleon I both counties merged to form the Duchy of Nassau on 30 August 1806, under the joint rule of Frederick Augustus, and his younger cousin Frederick William.
On 17 May 1803, he succeed as the Prince of Nassau-Usingen when his elder brother, Charles William died without male heirs.
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Friedrich August, born in Usingen, was a younger son of Prince Charles of Nassau-Usingen and Princess Christiane Wilhelmine of Saxe-Eisenach (daughter of John William III, Duke of Saxe-Eisenach).
It was not until the Treaty of Ryswick in 1697 that reconstruction work started again and Frederick Augustus brought in 220 Waldensians and Huguenots which he settled in a specially planned town coined “Augustistadt” (Augustus town) to the north of Gochsheim.
The dominion of Jever (which was anexed to Zerbst by the marriage of Prince Rudolph with Magdalene of Oldenburg, heiress of that land) was ruled under the Semi-Salic Law; for this, was given to the Empress Catherine II of Russia, born Princess Sophie Auguste Fredericka of Anhalt-Zerbst and Frederick Augustus's only surviving sibling.
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.