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Charles August was the second son of John Ernst of Nassau-Weilburg and Maria Polyxena of Leiningen-Dagsburg-Hartenburg.
Christian of Hesse-Wanfried-Rheinfels (17 July 1689 in Wanfried – 21 October 1755 in Eschwege) was a son of Landgrave Charles of Hesse-Wanfried (1649-1711) and his second wife Alexandrine Juliane of Leiningen-Dagsburg (d. 1703).
## married around 1730 to Sofie Eleonore (born: 1710 in Dagsburg; died: 19 June 1768), daughter of Count Leopold Emich of Leiningen (1685–1719) and his wife Countess Charlotte Amalie of Leiningen (1682–1729)
On 16 March 1748, She married Prince George William of Hesse-Darmstadt, the brother of the reigning Landgrave Louis IX of Hesse-Darmstadt in Heidesheim am Rhein.
The County of Dagsburg with its capital Dagsburg (now Dabo in France) existed in Lorraine in the 11th and 12th centuries when the area was still part of Alsace.
Emich Christian of Leiningen-Dagsburg (29 March 1642 in Dagsburg – 27 April 1702) was, by descent, Count of Leiningen and Dagsburg and, by inheritance, Lord of Broich, Oberstein and Bürgel.
Auguste Friederike (born: 17 August 1699 in Idstein; died: 8 June 1750 in Kirchheim unter Teck), a Princess of Nassau-Idstein, married 17 August 1723 with Prince Charles August of Nassau-Weilburg (born: 17 September 1685 in Weilburg; died: 9 November 1753 ibid), son of Count John Ernst of Nassau-Weilburg and Countess Maria Polyxena of Leiningen-Dagsburg-Hartenburg
The known siblings of Gertrude include (1) Gebhard III, Count of Sulzbach, (2) Adelheid, Abbess of Niedernburg at Passau, (3) Bertha of Sulzbach, Byzantine Empress, (4) Luitgarde, wife first of Godfrey II of Leuven and secondly of Hugo XII, Count of Dagsburg and Metz, and (5) Matilda of Sulzbach, wife of Engelbert III of Istria.
John Charles August was a son of Count George William of Leiningen-Dagsburg (born 8 March 1636 in Heidesheim am Rhein; died 18 July 1672 in Oberstein) and his wife Countess Anna Elisabeth von Daun-Falkenstein (born: 1 January 1636; died: 4 June 1685 at Schloss Broich).
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: married secondly 29 May 1727 Philippsruhe Castle with Duke John William of Saxe-Eisenach (born 17 October 1666 in Friedewald; died 14 January 1729 in Eisenach) , son of Duke John George I of Saxe-Eisenach (1634-1686) and his wife Countess Johannetta of Sayn-Wittgenstein (1626-1701)
His maternal grandparents were Charles William, Prince of Nassau-Usingen and Caroline Felizitas of Leiningen-Dagsburg-Falkenburg