Hereditary Grand Duke Guillaume celebrates his 39th birthday on Remembrance Day, Wednesday, 11 November 2020.

Hereditary Grand Duke Guillaume. Photo: © Cour grand-ducale / Marion Dessard

Guillaume Jean Joseph Marie, the eldest child of Grand Duke Henri and his wife Grand Duchess Maria Teresa, was born on 11 November 1981 at the Grand Duchess Charlotte Maternity Hospital in Luxembourg City.

He has four siblings: Prince Félix (1984), Prince Louis (1986), Princess Alexandra (1991) and Prince Sébastien (1992).

Prince Guillaume officially became the Hereditary Grand Duke on 18 December 2009, shortly after his father’s accession to the Grand Ducal throne.

Prince Guillaume Hereditary Grand Duke marries Countess Stephanie de Lannoy Notre Dame Cathedral
Prince Guillaume marries Countess Stéphanie de Lannoy in a religious wedding in Luxembourg on 20 October 2012. Photo: ©Grand-Ducal Court/Guy Wolff/All rights reserved

His siblings are Prince Félix (1984), Prince Louis (1986), Princess Alexandra (1991) and Prince Sébastien (1992).

The Hereditary Grand Duke married Countess Stéphanie de Lannoy in the Notre-Dame Cathedral in Luxembourg City on 20 October 2012.

Their son Prince Charles Jean Philippe Joseph Marie Guillaume was born on 10 May 2020 at the Maternité Grande-Duchesse Charlotte in Luxembourg.

Family of three. Photo: © Cour grand-ducale / Sophie Margue

Education and Military Training

He attended Lycée Robert-Schumann in Luxembourg, before attending two exclusive Swiss boarding schools, Institute Le Rosey and the Collège Alpin International Beau Soleil, where he obtained his French baccalaureate in 2001.

From September 2001 to August 2002, Prince Guillaume attended officer training at the Royal Military Academy Sandhurst.

Prince Guillaume was sworn in as an officer in the Luxembourg Army in December 2002, and currently holds the rank of Colonel.

He completed a post-graduate training course at the Royal College of Defence Studies (RCDS) in 2018 and 2019 where he gained additional expertise to be able to carry out future responsibilities.

Personal Life and Interests

The Hereditary Grand Duke enjoys reading autobiographies, philosophical treatises and historical novels focusing on politics, economics and philosophy.

He loves both classical and modern music, plays the piano and sang in a rock band during his school years.

Prince Guillaume enjoys outdoor activities such as skiing, swimming and water sports and plays tennis.

He speaks Luxembourgish, French, German, Spanish and English.

Four generations: Grand Duke Henri, Hereditary Grand Duke Guillaume standing in front of a portrait of Grand Duke Jean. Photo: © Grand Ducal Court / Sophie Margue


• Luxembourg Cycling Federation (Fédération du Sport cycliste luxembourgeois)
• The Youth Hostel Association of Luxembourg (Centrale des Auberges de Jeunesse)
• The Nnational Road Victims’ Association (Association nationale des victimes de la Route)
• The Luxembourg Chamber Music Orchestra (Orchestre de Chambre du Luxembourg)
• The European Union Youth Wind Orchestra
• The Jonk Entrepreneuren Luxembourg – an association promoting young entrepreneurs
• Special Olympics Luxembourg

The Hereditary Grand Duke is one of four board members of the Fondation du Grand-Duc et de la Grande-Duchesse which helps the most vulnerable and supports their integration and inclusion in society.

The foundation also provides individual requests for social assistance and to people with disabilities in Luxembourg whilst financing overseas development projects and humanitarian aid.

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