Nassau-Usingen was a county
A county is a jurisdiction of local government in certain modern nations. Historically in mainland Europe, the original French term, comté, and its equivalents in other languages denoted a jurisdiction under the sovereignty of a count A county is a jurisdiction of local government in certain...

 of the Holy Roman Empire
Holy Roman Empire
The Holy Roman Empire was a realm that existed from 962 to 1806 in Central Europe.It was ruled by the Holy Roman Emperor. Its character changed during the Middle Ages and the Early Modern period, when the power of the emperor gradually weakened in favour of the princes...

 in the Upper Rhenish Circle
Upper Rhenish Circle
The Upper Rhenish Circle was an Imperial Circle of the Holy Roman Empire established in 1500 on the territory of the former Duchy of Upper Lorraine and large parts of Rhenish Franconia including the Swabian Alsace region and the Burgundian duchy of Savoy....

 that became a principality
A principality is a monarchical feudatory or sovereign state, ruled or reigned over by a monarch with the title of prince or princess, or by a monarch with another title within the generic use of the term prince....

 in 1688.

The origin of the county lies in the medieval county of Weilnau that was acquired by the counts of Nassau-Weilburg in 1602.
That county was divided in 1629 into the lines of Nassau-Weilburg, Nassau-Idstein and Nassau-Saarbrücken
Nassau-Saarbrücken was a county of the Holy Roman Empire in the Upper Rhenish Circle. It belonged to the Walram branch of the House of Nassau.-County of Saarbrücken:...

 that was divided only 30 years later in 1659.

The emerging counties were Nassau-Saarbrücken, Nassau-Ottweiler and Nassau-Usingen. At the beginning of the 18th century 3 of the Nassau lines died out and Nassau-Usingen became their successor (1721 Nassau-Idstein, 1723 Nassau-Ottweiler und 1728 Nassau-Saarbrücken).
In 1735 Nassau-Usingen was divided again into Nassau-Usingen and Nassau-Saarbrücken. In 1797 Nassau-Usingen inherited Nassau-Saarbrücken.

On July 17, 1806 the counties of Nassau-Usingen and Nassau-Weilburg joined the Confederation of the Rhine
Confederation of the Rhine
The Confederation of the Rhine was a confederation of client states of the First French Empire. It was formed initially from 16 German states by Napoleon after he defeated Austria's Francis II and Russia's Alexander I in the Battle of Austerlitz. The Treaty of Pressburg, in effect, led to the...

. Under pressure from Napoleon
Napoleon I of France
Napoleon Bonaparte was a French military and political leader during the latter stages of the French Revolution.As Napoleon I, he was Emperor of the French from 1804 to 1815...

 both counties merged to become the Duchy of Nassau on August 30, 1806 under joint rule of Prince Frederick August of Nassau-Usingen and his younger cousin Prince Frederick William of Nassau-Weilburg
Frederick William, Duke of Nassau
Frederick William, Prince of Nassau-Weilburg was a ruler of Nassau-Weilburg. In 1806 he was given the title of Prince of Nassau, while his cousin, Prince Frederick Augustus of Nassau-Usingen, became the Duke of Nassau. Frederick William died in January 1816, only two months before his cousin...

. As Frederick August had no heirs he agreed that Frederick William should become sole ruler after his death. However Frederick William died from a fall on the stairs at Weilburg Castle on 9 January 1816 and it was his son William
William, Duke of Nassau
Wilhelm, Duke of Nassau, Prince of Nassau-Weilburg was the father of Adolphe, Grand Duke of Luxembourg and Queen Sophia .-Biography:Wilhelm was the eldest son of Frederick...

 who became duke of a unified Nassau.

List of rulers

reign name born died relation to predecessor
1640/59-1702 Walrad
Walrad, Prince of Nassau-Usingen
Walrad Usingen of Nassau , was from 1659 Count, and from 1688 Prince of Nassau-Usingen and founder of Usingen line of the House of Nassau.- Family :...

5-3-1635 17-10-1702 son of William Louis of Nassau-Saarbrücken
William Louis, Count of Nassau-Saarbrücken
William Louis of Nassau-Saarbrücken , was a Count of Saarbrücken.- Life :His parents were Louis II of Nassau-Weilburg and Landgravine Anna Maria of Hesse-Kassel...

1702-1718 William Henry
William Henry, Prince of Nassau-Usingen
Prince William Henry of Nassau-Usingen was from 1702 to 1718 Prince of Nassau-Usingen.- Parents :...

2-5-1684 14-2-1718 son of Walrad
1718-1775 Charles
Charles, Prince of Nassau-Usingen
Charles, Prince of Nassau-Usingen , was from 1718 to 1775 Prince of Nassau-Usingen.- Family :...

1-1-1712 21-6-1775 son of William Henry
1775-1803 Charles William 9-11-1735 17-5-1803 son of Charles
1803-1806 Frederick Augustus
Frederick Augustus, Duke of Nassau
Friedrich August, Duke of Nassau, Prince of Nassau-Usingen was the last Prince of Nassau-Usingen and, jointly with his cousin, Friedrich Wilhelm of Nassau-Weilburg, first Duke of Nassau...

23-4-1738 24-3-1816 brother of Charles William


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