Duchy of Nassau in the context of "County of Nassau"

The Battle of Waterloo was fought on Sunday 18 June 1815, near Waterloo (then in the United Kingdom of the Netherlands, now in Belgium), marking the end of the Napoleonic Wars. The French Imperial Army under the command of Napoleon I was defeated by two armies of the Seventh Coalition. One was a British-led force with units from the United Kingdom, the Netherlands, Hanover, Brunswick, and Nassau, under the command of field marshal Arthur Wellesley, Duke of Wellington. The other comprised three corps of the Prussian army under Field Marshal Blücher. The battle was known contemporaneously as the Battle of Mont Saint-Jean in France (after the hamlet of Mont-Saint-Jean) and La Belle Alliance in Prussia ("the Beautiful Alliance"; after the inn of La Belle Alliance).

Upon Napoleon's return to power in March 1815, the beginning of the Hundred Days, many states that had previously opposed him formed the Seventh Coalition to oppose him again, and hurriedly mobilised their armies. Wellington's and Blücher's armies were cantoned close to the northeastern border of France. Napoleon planned to attack them separately, before they could link up and invade France with other members of the coalition. On 16 June, Napoleon successfully attacked the bulk of the Prussian Army at the Battle of Ligny with his main force, while a small portion of the French Imperial Army contested the Battle of Quatre Bras to prevent the Anglo-allied army from reinforcing the Prussians. The Anglo-allied army held their ground at Quatre Bras but were prevented from reinforcing the Prussians, and on the 17th, the Prussians withdrew from Ligny in good order, while Wellington then withdrew in parallel with the Prussians northward to Waterloo on 17 June. Napoleon sent a third of his forces to pursue the Prussians, which resulted in the separate Battle of Wavre with the Prussian rear-guard on 18–19 June and prevented that French force from participating at Waterloo.

Kronberg im Taunus (German pronunciation: [ˈkʁoːnˌbɛʁk ʔɪm ˈtaʊnʊs] , lit. 'Kronberg in the Taunus') is a town in the Hochtaunuskreis district, Hesse, Germany and part of the Frankfurt Rhein-Main urban area. Before 1866, it was in the Duchy of Nassau; in that year the whole Duchy was absorbed into Prussia. Kronberg lies at the foot of the Taunus, flanked in the north and southwest by forests. A mineral water spring also rises in the town.

The Province of Hesse-Nassau (German: Provinz Hessen-Nassau) was a province of the Kingdom of Prussia from 1868 to 1918, then a province of the Free State of Prussia until 1944.

Hesse-Nassau was created as a consequence of the Austro-Prussian War of 1866 by combining the previously independent Hesse-Kassel (or Hesse-Cassel), the Duchy of Nassau, the Free City of Frankfurt, areas gained from the Kingdom of Bavaria, and areas gained from the Grand Duchy of Hesse (including part of the former Landgraviate of Hesse-Homburg from Hesse-Darmstadt). These regions were combined to form the province Hesse-Nassau in 1868 with its capital in Kassel and redivided into two administrative regions: Kassel and Wiesbaden. The largest part of the province surrounded the province of Upper Hesse in the Grand Duchy of Hesse (People's State of Hesse from 1918).

The County of Wied (German pronunciation: [viːt] ) was a territory of the Holy Roman Empire located on the river Wied where it meets the Rhine. Wied emerged as a County earlier than many other German states. From 1243–1462, Wied was united with an Isenburgian County as Isenburg-Wied. Wied was partitioned twice: between itself and Wied-Dierdorf in 1631, and between Wied-Neuwied and Wied-Runkel in 1698. The county was incorporated into the Duchy of Nassau in 1806 and into the Kingdom of Prussia at the Congress of Vienna in 1815. Since 1946, its territory has been part of the German state of Rhineland-Palatinate. Via William of Albania, the House of Wied ruled the Principality of Albania in 1914.

The House of Nassau is a European aristocratic dynasty. The name originated with a lordship associated with Nassau Castle, which is located in what is now Nassau in Rhineland-Palatinate, Germany. With the fall of the Hohenstaufen dynasty in the first half of the 13th century, royal power within Franconia evaporated and the former stem duchy fragmented into separate independent states. Nassau emerged as one of those independent states as part of the Holy Roman Empire. The lords of Nassau were originally titled "Counts of Nassau", subject only to the Emperor, and then elevated to princely rank as "Princely Counts". Early on, the family divided into two main branches – the elder (Walramian) branch, which gave rise to the German king Adolf, and the younger (Ottonian) branch, which gave rise to the Princes of Orange and the monarchs of the Netherlands.

At the end of the Holy Roman Empire and the Napoleonic Wars, the Walramian branch had inherited or acquired all the Nassau ancestral lands and proclaimed themselves, with the permission of the Congress of Vienna, the "Dukes of Nassau", forming the independent state of Nassau (with its capital at Wiesbaden). This territory now mainly lies in the German Federal State of Hesse, and partially in the neighbouring State of Rhineland-Palatinate. The Duchy was annexed by Prussia in 1866 after the Austrian-Prussian War as an ally of Austria. It was subsequently incorporated into the newly created Prussian Province of Hesse-Nassau.

Nassau Castle, located in Nassau, Rhineland-Palatinate, Germany and named after it, was a castle and the ancestrial seat of the House of Nassau and also its namesake, also it is the namesake of the historical Nassau realms of the County and Duchy of Nassau . The ruins of the castle are situated on a rock outcropping about 120 m (390 ft) above the Lahn River. The House of Nassau was an aristocratic dynasty among whose descendants are the present-day monarchy of the Netherlands and Luxembourg.