The Head of State

The constitutional monarchy

Article 1 of the Constitution declares that the Grand Duchy is a “democratic, free, independent and indivisible state”. Luxembourg is a representative democracy in the form of a constitutional monarchy.

S.A.R. le Grand-Duc Jean signe l'arrêté grand-ducal d'abdication
© Collection Cour grand-ducale

H.R.H. Grand Duke Jean signs the Grand Ducal abdication order

A constitutional monarchy is a type of political regime that recognises a hereditary Monarch as Head of State. This system of the succession of power is based on the constitutionally enshrined principle that the Crown of the Grand Duchy passes from one member of the Nassau family to another member of the same family.

This section provides more information on the order of succession to the Throne in the event of death or abdication by the reigning Monarch, on the Regency in the event of the Grand Duke’s temporary incapacity and on the Lieutenance, which allows the Grand Duke to delegate certain powers to his Lieutenant-Représentant.

© Collection Cour grand-ducale
Swearing-in ceremony of H.R.H. Grand Duke Henri

Order of succession

Under the terms of Article 3 of the Constitution, the Crown of the Grand Duchy is hereditary in the Nassau family, in accordance with the Pact of 30 June 1783, Article 71 of the Treaty of Vienna of 9 June 1815, and Article 1 of the Treaty of London of 11 May 1867.

The Congress of Vienna of 1815 ceded the Grand Duchy to the King of the Netherlands, William I, Prince of Orange-Nassau, 'to be possessed in perpetuity by him and his successors in complete ownership and sovereignty’. The Final Act of the Congress thus applied the order of succession established between the two branches of the House of Nassau by the Pact of 1783 to the Grand Duchy of Luxembourg.

While the first chapter of the Family Pact of 1783 describes the sovereign possessions of the House of Nassau, the second chapter is devoted to the order of succession. At that time, the Crown was transmitted according to Salic law in direct line by order of primogeniture to male descendants, excluding female descendants. In the absence of a male descendant in direct and collateral line in one of the branches of the House of Nassau, the Crown passed by right to the male descendants of the other branch. In the absence of male offspring in direct and collateral line in both branches, the Crown passed in order of primogeniture to the female offspring of the ruling dynasty.

The Treaty of London of 1867 redefined the status of the Grand Duchy. Napoleon III tried to acquire Luxembourg, but failed because of Bismarck’s refusal to allow a former member of the German Confederation to fall under French rule. At the time, the City of Luxembourg was still occupied by a Prussian federal garrison. Following the 'Luxembourg Crisis’, an international conference was organised in London to prevent a French-Prussian war. Prussia agreed to withdraw its garrison from the fortress of Luxembourg. The Grand Duchy was declared perpetually neutral. Article 1 of the treaty maintained the ties between the Grand Duchy and the House of Orange-Nassau and confirmed the rights that the agnates (the descendants by male links from a common male ancestor) of the House of Nassau have over the Grand Duchy.

The order of succession, as set down in the Family Pact, has been amended twice since then.

In 1906, Grand Duke Guillaume IV sensed that his health was worsening and that the question of who would succeed him would soon arise, since six daughters were born from his marriage to Maria Ana of Braganza. He therefore issued a new family statute to guarantee his daughters’ succession to the throne. This statute was based on Article 42 of the Family Pact, which stipulated that after the extinction of all the male members of the House of Nassau, the female line of succession would come into play. The 1907 statute also stipulated that the younger princesses would be next in line if there were no male descendant of Grand Duchess Marie-Adélaïde. Princess Marie-Adélaïde was declared heir apparent to the Crown. This statute was submitted to the Chamber of Deputies, which gave it the force of law on 10 July 1907.

On 20 June 2011, by order of Grand Duke Henri, the Marshal of the Court announced a new internal regulation introducing absolute primogeniture to the order of succession within the House of Luxembourg-Nassau. This guarantees equality between men and women in terms of succession to the Throne. This new order of succession first applies to the descendants of Grand Duke Henri.

Currently, the succession to the throne is guaranteed by Prince Guillaume, the Crown Prince. His son, Prince Charles, is second in the order of succession.


The role of a Regent is to take on the function of Grand Duke and to assume his duties on an interim basis if the Grand Duke is unable to perform them.

The conditions for a Regency and its modalities are enshrined in the Constitution of the Grand Duchy:

  • If, on the death of the Grand Duke, the successor is a minor, the Regency is exercised in accordance with the Family Pact (Article 6 of the Constitution). The surviving relative of the underage Grand Duke acts as Regent.
  • 'If the Grand Duke is unable to reign, the Regency is to be instituted as in the case of minority’ (Article 7, paragraph 1 of the Constitution).
  • 'Should the throne become vacant, the Chamber of Deputies will make temporary arrangements for a Regency. A new Chamber of Deputies, to be summoned within 30 days with double the customary number of members, shall take the final steps to fill the vacancy’ (Article 7, paragraph 2 of the Constitution).
  • When taking up his role, the Regent takes the following oath: 'I swear loyalty to the Grand Duke. I swear to observe the Constitution and the laws of the country’ (Article 8).

The Regent takes office only upon taking the oath. He has all the prerogatives of the Head of State, whose place he occupies ad interim, but article 115 of the Constitution stipulates that no changes may be made to the Constitution during a Regency.

© Collection Cour grand-ducale
Swearing-in of Duke Adolphe of Nassau as Duke-Regent.

So far, there have been two Regents in the Grand Duchy:

  • Duke Adolphe of Nassau, later Grand Duke of Luxembourg, exercised the first two Regencies. His first Regency began at the end of the reign of King Grand Duke William III, from 8 April 1889 (he was sworn in on 11 April 1889) and ended on 3 May 1889. The second lasted only a short while, from 4 November 1890 (he was sworn in on 6 November 1890) to 23 November 1890, when King Grand Duke William III died.

  • The other two Regencies were held by Grand Duchess Maria Ana, wife of Grand Duke Guillaume IV. She first became Regent during the final illness of Grand Duke Guillaume IV on 13 November 1908 (she was sworn in on 19 November 1908). It lasted until 25 February 1912 following the death of Guillaume IV. Her second Regency lasted from 25 February 1912 to 14 June 1912, while Grand Duchess Marie-Adélaïde was still a minor.

© Collection Cour grand-ducale
H.R.H. Crown Prince Jean of Luxembourg during the official swearing-in ceremony as Lieutenant-Représentant of his mother, H.R.H. Grand Duchess Charlotte.


The Grand Duke may be represented by a blood-related Prince or Princess, who will have the title of Lieutenant-Représentant of the Grand Duke and must reside in the Grand Duchy. The Lieutenant-Représentant will take an oath to observe the Constitution before being able to exercise their powers (Article 42).

The Grand Duke delegates his powers to his Lieutenant and this acting capacity may be either temporary or permanent. The Grand Duke can restrict the extent of the mandate as he deems necessary. The powers of the Lieutenant-Représentant are therefore limited by this mandate. However, the measures they take by virtue of their mandate have the same effect as if they were issued by the Grand Duke himself.

© Collection Cour grand-ducale / SIP
Swearing-in ceremony of H.R.H. Crown Prince Henri of Luxembourg as Lieutenant-Représentant of Grand Duke Jean.

There have been five Lieutenancies in the history of the Grand Duchy:


  • The first Lieutenancy was that of Prince Hendrik of the Netherlands, who was appointed by his brother, King Grand Duke William III, on 5 February 1850 (swearing-in on 24 October 1850). It lasted for almost 30 years, until Prince Hendrik’s death on 13 January 1879.
  • The second Lieutenancy was that of Prince Guillaume of Nassau, later Grand Duke Guillaume IV, who was appointed by his father, Grand Duke Adolphe, then 85 years old, as Lieutenant-Représentant on 4 April 1902 (swearing in on 14 April 1902). It ended with his accession to the Throne following Grand Duke Adolphe’s death on 17 November 1905.
  • The third Lieutenancy took place from 19 March 1908 (swearing-in on 2 April 1908) when Grand Duke Guillaume IV appointed his wife Grand Duchess Maria Ana as Lieutenant-Représentant due to his poor health. She remained Lieutenant until 13 November 1908, when she became Regent.
  • The fourth Lieutenancy was that of Crown Prince Jean, appointed Lieutenant-Représentant of Grand Duchess Charlotte on 28 April 1961 (swearing in on 4 May 1961). It ended on 12 November 1964 with the abdication of Grand Duchess Charlotte in his favour.
  • The fifth Lieutenancy was that of Crown Prince Henri, which started on 3 March 1998 (sworn in on 4 March 1998). This lasted until 7 October 2000, with the abdication of Grand Duke Jean in his favour.


See also:

Portrait du Grand-Duc

More information about the head of state

Learn more about the role of the head of state and about the Grand Duke, the National Day and much more.

Grand-Duc portait

The Constitution of Luxembourg

Find the Constitution in the Official Journal of the Grand Duchy of Luxembourg