The Hereditary Grand Duke completed internships at the Belgian Chemical Union in 2003, at the Deutsche Bank in London in 2004, and at the Spanish branch of ArcelorMittal in 2005.[8] Sworn in December 2002 as an officer in the Luxembourg Army, Prince Guillaume holds the rank of colonel.[8]
Hereditary Grand Duke
Guillaume was heir apparent to the crown of Luxembourg from his father's accession in 2000 until 2025, when he became Grand Duke following Henri’s abdication.
Guillaume became the honorary chairman of the Board of Economic Development of the Grand Duchy of Luxembourg, an agency for economic promotion and development, in March 2001.[9][8] He has also been a member of the Council of State since 24 June 2005.[9] He attended the Millennium Conference at the United Nations headquarters in New York City in 2005.[8] Prince Guillaume also worked at the European Commission and the Permanent Representation of Luxembourg to the European Union in Brussels in 2012.[8]
The Hereditary Grand Duke is patron of the Luxembourg Cycling Sport Federation, Youth Hostels Central, National Association of Road Victims, Chamber Orchestra of Luxembourg, Youth Harmony Orchestra of the European Union, as well as to Young Entrepreneurs Luxembourg and Special Olympics Luxembourg Associations.[9]
During the summer of 1997, Guillaume participated as a member of Luxembourg Scout Movement in a humanitarian camp in Nepal. He was involved in a reforestation project and other actions for the benefit of less fortunate communities. In 2017, the Hereditary Grand Duke joined the board of directors of the World Scout Foundation to support the development of scouting around the world.[9]
In 1999, he participated in a charitable mission in Aguascalientes to provide the educational and social assistance to young people in one of the most deprived areas in Mexico. After having chaired the Kräizbierg Foundation, which works for people with disabilities, for more than 10 years (2000–2011), the Hereditary Grand Duke accepted the title of honorary president in March 2011.[9]
Since 18 January 2016, the Hereditary Grand Duke has been a member of the board of directors of Europäische Stiftung Kaiserdom zu Speyer Foundation.[9] He is also a member of the board of directors of the Fondation du Grand-Duc et de la Grande-Duchesse.[9]
On interviews for his 30th birthday, he stated that he was in a relationship with a "dear miss" that had been going strong for more than a year but needed more time to evaluate their possible future. On 26 April 2012, the court announced the engagement of the Hereditary Grand Duke to the Belgian Countess Stéphanie de Lannoy.[10] The civil wedding took place on 19 October 2012; the religious wedding took place on 20 October 2012, at the Notre-Dame Cathedral.[11]
François Henri Louis Marie Guillaume (born 27 March 2023)
Reign
Guillaume with Stéphanie on the day of his accession to the throne
On 8 October 2024, as had been announced by Grand Duke Henri on his Official Birthday that year, Guillaume was appointed as lieutenant representative (regent).[14] Under this capacity, he assumed a number of his father's constitutional powers,[15] such as the swearing in of ambassadors and the signing of Grand Ducal Decrees. This is traditionally the first step in the abdication process in Luxembourg, as both Jean (1961–1964) and Henri (1998–2000) have previously served in the position.[16] On 24 December 2024, during his Christmas message, Henri announced that the abdication would take place on 3 October 2025.[17]
Guillaume acceded to the throne on that date, becoming Grand Duke of Luxembourg.[18]
↑ Although he is the fifth Grand Duke with the name, both government and court sources have referred to him simply as "Grand Duke Guillaume".[2][3] In an interview with Paris Match, he referred to himself using the title Guillaume V, including a regnal number, expressing that he would be known as such "because I am the fifth Guillaume of the Nassau dynasty".[4]
1 2 3 4 "CURRICULUM VITAE OF HIS ROYAL HIGHNESS THE HEREDITARY GRAND DUKE OF LUXEMBOURG"(PDF). Grand Ducal Court of Luxembourg (official). Luxembourg: Cour Grand Ducale. 9 November 2020. Archived from the original(PDF) on 20 June 2020. Retrieved 9 December 2020. Prince Guillaume attended primary school in Lorentzweiler and continued his education in the Lycée Robert Schuman until the fourth year of Luxembourgish secondary education. Then he pursued his studies at the Le Rosey Institute and at the Collège Beausoleil in the Swiss Alps, where he passed his French Baccalaureate in 2001. From September 2001 until August 2002, the Hereditary Grand Duke accomplished his Officer training at the Sandhurst Royal Military Academy in the United Kingdom....In 2009, the Hereditary Grand Duke graduated with honours with a Bachelor's degree in Humanities and Languages, specialising in Political Science, at the University of Angers (France).
↑ "H.R.H. Guillaume the hereditary Grand Duke of Luxembourg". University of Luxembourg. Luxembourg: Université du Luxembourg. Archived from the original on 9 December 2020. Retrieved 9 December 2020. After his military training at the Royal Military Academy Sandhurst, Guillaume studied history and politics at the University of Durham, at Brunel University in London and at the University of Angers in France.
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