| (Princely) County of Nassau → Principalities of Nassau (Gefürsteter) Grafschaft Nassau → Fürstentümer Nassau |
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| State of the Holy Roman Empire | ||||
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Coat of arms |
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| County of Nassau in 1547 | ||||
| Capital | Nassau | |||
| Government | Principality | |||
| Historical era | Middle Ages | |||
| - City founded | 915 | |||
| - Robert I claims title of count | 1125 | |||
| - Comital title acknowledged | 1159 | |||
| - Partitioned multiple times | 1255–1806 | |||
| - Remaining parts unified to form duchy |
1806 | |||
| Duchy of Nassau Herzogtum Nassau (de) |
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| State of the Confederation of the Rhine State of the German Confederation |
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| The duchy within the German Confederation in 1815 | |||||
| Capital | Weilburg Wiesbaden (after 1816) |
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| Government | Principality | ||||
| Historical era | Modern era | ||||
| - Duchy established | 1806 | ||||
| - Constitution | 1814 | ||||
| - Joined German Confederation |
1815 | ||||
| - Annexed by Prussia | 1866 | ||||
| - Adolphe became Grd Duke Luxembourg |
1890 | ||||
Nassau was a German state within the Holy Roman Empire and later in the German Confederation. Its ruling dynasty, now extinct in male line, was the House of Nassau.
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Nassau, originally a county, emerged on the lower Lahn river in what is today Rhineland-Palatinate. The town of Nassau was founded in 915. Robert, son of Dudo-Henry, Count of Laurenburg, who had held Nassau as a fiefdom granted by the Bishopric of Worms, built a Nassau Castle here about 1125, calling himself "Count of Nassau". Nevertheless this title was not acknowledged by the Bishop of Worms until 1159 under the rule of Robert's son Walram.
The Nassauers held the territory between the Taunus and the Westerwald at the lower and middle Lahn. By 1128, they acquired the bailiwick of the Bishopric of Worms, which had numerous rights in the area, and thus created a link between their heritage at the lower Lahn and their possessions near Siegen. By the middle of the 12th century, this relationship was strengthened with the acquisition of parts of the Hesse-Thüringen feudal kingdom, namely the Herborner Mark, the Kalenberger Zent and the Court of Heimau (Löhnberg). Closely linked to this was the "Lordship of Westerwald", which was also in Nassau possession at this time. At the end of the 12th century, the House had also acquired the Reichshof Wiesbaden as an important base in the southwest.
After the Counts of Nassau acquired the estates of Weilburg, the sons of Count Henry II in 1255 divided Nassau for the first time. Walram II received the county of Nassau-Weilburg, while his younger brother, Otto I, held the County of Nassau-Siegen and Nassau-Dillenburg from 1328 on, the estates north of the Lahn river.The boundary line was essentially the Lahn, with Otto receiving the northern part of the county with the cities of Siegen, Dillenburg, Herborn and Haiger and Walram retaining the part south of the river with the cities of Weilburg and Idstein.
Walram's son Adolf became King of Germany in 1292. His son Count Gerlach abdicated in 1344 and the County was divided under his sons in 1355:
fell back to Nassau-Weilburg in 1605
In 1605, all parts of Nassau-Weilburg were again unified under Count Louis II, however after his death in 1627 his sons divided the county again:
After Nassau-Usingen had inherited Nassau-Ottweiler with former Nassau-Idstein and Nassau-Saarbrücken, it was reunified with Nassau-Weilburg and raised to the Duchy of Nassau in 1806.
After the death of Count Otto I, his county was divided under his sons in 1303:
In 1504 Henry III of Nassau-Dillenburg inherited the County's estates at Breda in the Duchy of Brabant, while his younger brother William became Count of Nassau-Dillenburg in 1516. After the son of Henry III, René of Châlon died in 1544, Count William's eldest son William the Silent became Prince of Orange and Lord of Breda, Stadtholder in the Low Countries from 1559 on. His younger brother John VI again reunited all Nassau-Dillenburg possessions in 1561, though the County was again divided after his death in 1606:
The Counts of Nassau-Diez, descendants of William Frederick were stadtholders of Friesland, Groningen and Drenthe and Princes of Orange from 1702 on. Though they lost their county in 1806, the House of Orange-Nassau — in female succession — is the royal house of the Netherlands and was the reigning house of the Grand Duchy of Luxembourg until 1890.
On July 17, 1806 the remaining counties of Nassau-Usingen and Nassau-Weilburg joined the Confederation of the Rhine. Under pressure from Napoleon both counties merged to the Duchy of Nassau on August 30, 1806 under joint rule of Frederick August, Prince of Nassau-Usingen, and his younger cousin Frederick William, Prince of Nassau-Weilburg. 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 who became Duke of Nassau.
At the 1815 Congress of Vienna the Principality of Orange-Nassau was incorporated into the Duchy of Nassau and subsequently the unified duchy joined the German Confederation. Through the extinction of most lines, the Nassau-Usingen branch of the Nassau-Weilburg line under Duke William became the reigning house of Nassau until after the Austro-Prussian War in 1866 it was annexed by the Kingdom of Prussia and incorporated into the Province of Hesse-Nassau. William's son Adolphe, last Duke of Nassau, received Luxembourg after the male line of Nassau-Dillenburg became extinct in 1890.
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