Grand Duke of Luxembourg in the context of "Duchy of Luxembourg"

Place Guillaume II (French pronunciation: [plas ɡijom dø]) is a town square in Luxembourg City, in southern Luxembourg. The square is in the heart of Luxembourg's historic Ville Haute quarter. It is colloquially known as Knuedler, from the Luxembourgish language's word for "knot", referring to the knot in the belt worn by Franciscan friars.

The western half of the square is dominated by Luxembourg City Hall in the southwest, whilst the equestrian statue to former Grand Duke William II, after whom the square is named, is the prominent feature of the eastern half. Much of the square is ringed with trees, narrowing the open area (particularly around the statue).

The Robertians (sometimes called the Robertines in modern scholarship) are a proposed Frankish noble family and royal dynasty, whose members were ancestors of the Capetian dynasty that ruled over the Kingdom of France and several other countries (currently Spain and Luxembourg). Prominent Robertian ancestors of the Capetian dynasty appear in historical records as powerful nobles serving under various rulers of the Carolingian dynasty, mainly in West Francia, which later became France. Most notable of them were: the eponymous count Robert the Strong (d. 866) and his sons, West Frankish kings Odo (888–898) and Robert I (922–923), whose son – duke Hugh the Great was father to the first Capetian king Hugh Capet (987–996).

Adolphe (Adolf Wilhelm August Karl Friedrich; 24 July 1817 – 17 November 1905) was Grand Duke of Luxembourg from 23 November 1890 to his death on 17 November 1905. The first grand duke from the House of Nassau-Weilburg, he succeeded King William III of the Netherlands, ending the personal union between the Netherlands and Luxembourg. Adolphe was Duke of Nassau from 20 August 1839 to 20 September 1866, when the Duchy was annexed to the Kingdom of Prussia.

The Duchy of Nassau (German: Herzogtum Nassau) was an independent state between 1806 and 1866, located in what became the German states of Rhineland-Palatinate and Hesse. It was a member of the Confederation of the Rhine and later of the German Confederation. Its ruling dynasty, later extinct, was the House of Nassau. The duchy was named after the Nassau Castle, itself after its historical core city, Nassau, although Wiesbaden rather than Nassau was its capital. In 1865, the Duchy of Nassau had 465,636 inhabitants. After being occupied and annexed into the Kingdom of Prussia in 1866 following the Austro-Prussian War, it was incorporated into the Province of Hesse-Nassau. The area is a geographical and historical region, Nassau, and Nassau is also the name of the Nassau Nature Park within the borders of the former duchy.

The Grand Duke of Luxembourg still uses "Duke of Nassau" as his secondary title, and "Prince" or "Princess of Nassau" is used as a title by other members of the grand ducal family. Nassau is also part of the name of the Dutch royal family, which styles itself Orange-Nassau.

William III (Dutch: Willem III, French: Guillaume III; 19 February 1817 – 23 November 1890) was King of the Netherlands and Grand Duke of Luxembourg from 1849 until his death in 1890, and was also the Duke of Limburg from 1849 until the abolition of the duchy in 1866. Having reigned for 41 years, he is the second-longest reigning Dutch monarch, only surpassed by his daughter, Wilhelmina.

William was the son of King William II and Anna Pavlovna of Russia. On the abdication of his grandfather William I in 1840, he became the Prince of Orange. On the death of his father in 1849, he succeeded as king of the Netherlands.

William II (Dutch: Willem II, French: Guillaume II; 6 December 1792 – 17 March 1849) was King of the Netherlands, Grand Duke of Luxembourg, and Duke of Limburg. He reigned for nearly nine years, making him the shortest-reigning monarch in Dutch history.

William II was the son of William I and Wilhelmine of Prussia. When his father, who up to that time ruled as sovereign prince, proclaimed himself king in 1815, he became Prince of Orange as heir apparent of the United Kingdom of the Netherlands. With the abdication of his father on 7 October 1840, William II became king. During his reign, the Netherlands became a parliamentary democracy with the new constitution of 1848. William II was married to Anna Pavlovna of Russia, with whom he had five children. William II was succeeded by his son William III.

Berg Castle (Luxembourgish: Schlass Bierg, pronounced [ˈʃlɑs ˈbiːɐ̯ɕ]; French: Château de Berg; German: Schloss Berg) is the principal residence of the Grand Duke of Luxembourg. It is situated in the town of Colmar-Berg, in central Luxembourg, near the confluence of the Alzette and the Attert, two of Luxembourg's most important rivers.

Colmar-Berg (German pronunciation: [ˈkɔlmaʁ ˈbɛʁk]; Luxembourgish: Colmer-Bierg) is a commune in central Luxembourg, in the canton of Mersch. It comprises the localities of Colmar and Berg, situated on either bank of the river Attert, as well as Welsdorf.

Colmar-Berg is the site of the Grand Duke of Luxembourg's principal residence, Berg Castle. It is also the site of a Goodyear tyre factory.

There are twelve towns in Luxembourg, as defined by statute. Despite the status as towns, they are not all contiguous urbanised areas. They are similar to communes, but have been given a separate legal status. There is a technical difference between the status of commune and towns, but this is limited in practicality. One difference is that échevins in towns are formally appointed by the Grand Duke, whereas échevins for other communes are appointed by the Minister for the Interior.