Amalie Charlotte Wilhelmine Louise of Nassau-Weilburg (7 August 1776 - 19 February 1841). Married Victor II, Prince of Anhalt-Bernburg-Schaumburg-Hoym.
Coïncidentally the estate of the earliest recorded Nassaus, the Counts of Laurenburg, lay within the miniature Principality of Anhalt-Bernburg-Schaumburg-Hoym, which just was a tiny Ascanian exclave among the Nassau lands by the river Lahn.
The ruined Laurenburg, the ancestral castle of the earliest Nassaus in the background, and down by the river Lahn in the foreground the later Schloss Laurenburg, summer residence of the Princes of Anhalt-Bernburg-Schaumburg-Hoym (in winter I think they resided in Anhalt):
Laurenburg had been bought as part of the Lordship of Esterau from Prince Johan Ludwig of Nassau-Hadamar by the Nassau subject Count Peter Melander né Eppelmann, Imperial Commander during the 30 Years War, for whom it was made into the Immediate Imperial County of Holzappel. (I've been to the "capital", the village of Holzappel just behind the Laurenburg. Don't go swimming in the local swim hole the Hertha Sea even though it's ever so hot- it's disgusting!) His wife bought the until then also Nassauian Lordship of Schaumburg on the other southern side of the Lahn and their daughter inherited all. She was married to Prince Adolf of Nassau-Dillenburg and their youngest daughter, who inherited the Holzappel-Schaumburg territories, married a Prince of Anhalt-Bernburg-Hoym. That's how it ended up as an Ascanian outpost.
Castle Schaumburg by the Lahn:
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This impressive, though unfinished castle in English Neo-Gothic style is the work of Archduke Stefan of Austria, son and heir of the A-B-S-H heiress Princess Hermine (and stepson of Grand Duchess Alexandra Pavlovna of Russia!) A-B-S-H had been mediatized to the Duchy of Nassau, but allodial property remained, of course. Since Archduke Stefan was unmarried and childless, there erupted a bitter succession dispute between the descendants of Hermine's sisters, the Grand Duke of Oldenburg and the Prince of Waldeck-Pyrmont. As always Ebenbürtigkeit was involved, but also George Washington's distant German relations the Barons Washington! Details can be found at Heraldica under
the Holzappel Case. Since the Grand Duke of Oldenburg, who had married two A-B-S-H sisters had no ebenbürtige heirs by the senior sister, the estate passed to Princess Emma's son the Prince of Waldeck-Pyrmont, married to Princess Helene of Nassau and father of Queen Emma of the Netherlands. That is why Queen Wilhelmina spent some time there in her youth to recuperate from illness, though it's no longer a Waldeck property.
Having biked along the entire river Lahn from its source to its confluence with the Rhine, I can vouche for the Lahn Valley being a most beautiful part of (Hesse) and the Duchy of Nassau, like a smaller version of the romantic Rhine Valley:
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(On the right the town of Nassau with the tower on the hill where the original Nassau castle stood.)
Overview map of the Duchy of Nassau traversed by the river Lahn and bordered by the Rhine - and more detailled map better showing the inherited and mediatized territories it was made up of:
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Blue - Principality of Nassau-Weilburg
Light green - Principality of Nassau-Usingen (inherited by Nassau-Weilburg)
Darker green - the Ottonian Principality of Nassau-Diez. (much of the territories of the Ottonian or Dutch branch, i.e. the industrial Nassau-Siegen (see outline on left map) went to Prussia though, in return for the Grand Duchy of Luxembourg.)
Yellow - mostly Hesse-Kassel
Brown - smaller immediate territories, among them Holzappel and Schaumburg and Wied-Runkel
Purple - ecclesiastical territories, mostly the Electorate/Archbishopric of Trier, the Electorate/Archbishopric of Mainz in the east (Taunus)
And of course the Duchy of Nassau was one of Germany's most typical spa states, with both Selters (its carbonated water also being known as Seltzer), Bad Ems and Wiesbaden being within its borders. But that's another long story...
