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Frederick Augustus, Duke of Nassau

Frederick Augustus
Friedrich August (Nassau-Usingen).jpg
Frederick Augusts, Duke of Nassau
Duke of Nassau
Reign 30 August 1806 – 24 March 1816
Predecessor None. New Title
Successor William
Prince of Nassau-Usingen
Reign 17 May 1803 – 24 March 1816
Predecessor Charles William
Successor None. Incorporated into the Duchy of Nassau
Born (1738-04-23)April 23, 1738
Usingen, Principality of Nassau-Usingen
Died March 24, 1816(1816-03-24) (aged 77)
Schloss Biebrich, Wiesbaden, Duchy of Nassau
Spouse Princess Luise of Waldeck
Issue Princess Christiane Luise
Princess Karoline Friederike
Princess Augusta
Prince Friedrich Wilhelm
Princess Lousie Maria
Princess Friederike Victoria
Prince Frederick Charles
Full name
Friedrich August
House House of Nassau-Usingen
Father Charles, Prince of Nassau-Usingen
Mother Princess Christiane Wilhelmine of Saxe-Eisenach
Religion Calvinism
Full name
Friedrich August

Friedrich August, Duke of Nassau, Prince of Nassau-Usingen (23 April 1738 in Usingen – 24 March 1816 in Wiesbaden) was the last Prince of Nassau-Usingen and, jointly with his cousin, Friedrich Wilhelm of Nassau-Weilburg, first Duke of Nassau. He died without surviving male issue and was succeeded by his cousin's son, Wilhelm.

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). From 1744, he lived with his parents in Schloss Biebrich in Wiesbaden. He followed a military career in the army of the Holy Roman Empire and served in the Seven Years' War. In 1790, he became a Field Marshal.

On 17 May 1803, he succeeded as the Prince of Nassau-Usingen when his elder brother, Charles William, died without male heirs. On 6 July 1806, he joined the Confederation of the Rhine in order to prevent Napoleon from annexing the principality. Shortly thereafter, on 30 August 1806, he agreed with his cousin Friedrich Wilhelm of Nassau-Weilburg that their territories should be united into a single Duchy of Nassau with Frederick Augustus as the first duke and Frederick William as co-ruler. Since Friedrich August's sons had died young, it was also agreed that the combined duchy and sole rulership would pass to the heir of the Nassau-Weilburg line.


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