Who Is Guillaume, Hereditary Grand Duke of Luxembourg? Age, Biography and Wiki
Born on November 11, 1981, Guillaume is the eldest son of Henri, Grand Duke of Luxembourg, and Maria Teresa, Grand Duchess of Luxembourg. As of 2025, he is 43 years old. Known for his roles in modernizing the Grand Duchy's image, Guillaume has been an active member of the Luxembourg Royal Family, participating in various ceremonial duties and charitable events.
For a deeper look into his lineage and responsibilities, you can check his Wikipedia page.
| Occupation | Prince |
|---|---|
| Date of Birth | November 11, 1981 |
| Age | 43 Years |
| Birth Place | Grand Duchess Charlotte Maternity Hospital, Luxembourg City, Luxembourg |
| Horoscope | Scorpio |
| Country | Luxembourg |
Popularity
Guillaume, Hereditary Grand Duke of Luxembourg's Popularity over time
Height, Weight & Measurements
Guillaume stands tall at approximately 6 feet (183 cm) and maintains a weight of around 80 kg (176 lbs). His athletic build is complemented by a well-groomed appearance, reflecting his royal standing.
Family, Dating & Relationship Status
As of 2025, Guillaume is happily married to Stephanie de Lannoy, a member of the Belgian nobility. The couple tied the knot on October 20, 2012, and they share three children: Prince Charles, Prince Joseph, and Prince Louis. Before his marriage, Guillaume was known to have had a close relationship during his university years, but it’s his commitment to family and public service that has truly characterized his public image.
Prince Guillaume, Hereditary Grand Duke of Luxembourg (Guillaume Jean Joseph Marie; born 11 November 1981), is the heir apparent to the Luxembourg throne since October 2000 and regent of the country since October 2024, as the son of Grand Duke Henri and Grand Duchess Maria Teresa. He is set to become Grand Duke on 3 October 2025 upon the abdication of his father.
Net Worth and Salary
Guillaume’s estimated net worth in 2025 is around $8 million. His earnings primarily stem from his royal stipend, public engagements, and various investments, but specific details about his salary are not publicly disclosed. Additionally, he partakes in official duties that promote Luxembourg both domestically and internationally.
Career, Business and Investments
With a robust educational background, Guillaume initially pursued a degree in Political Science at the University of Exeter, before later attending the Royal Military Academy in Belgium. His career is largely centered around public service and royal duties, but he has also been actively involved in various projects aimed at economic development and innovation in Luxembourg. Furthermore, he is known to have investments in sustainable ventures and local businesses, aligning with global shifts towards sustainability.
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. He has also been a member of the Council of State since 24 June 2005. He attended the Millennium Conference at the United Nations headquarters in New York City in 2005.
Prince Guillaume also worked at the European Commission and the Permanent Representation of Luxembourg to the European Union in Brussels in 2012.
Social Network
Guillaume maintains a moderate social media presence, often using official royal accounts to connect with the public. He understands the importance of social media in today’s world, which has enabled the royal family to engage with younger generations. Check out the official social media accounts of the Grand Ducal Court for updates and news.
Education
Guillaume’s educational journey is notable, having honed his leadership and diplomatic skills at prestigious institutions. He graduated with a degree in Political Science in 2006 from the University of Exeter, followed by military training, paving his way to fulfill his duties as the future Grand Duke of Luxembourg effectively.
Guillaume's education includes Lycée Robert-Schumann in Luxembourg; Swiss boarding schools the Institut Le Rosey and the Collège Alpin International Beau Soleil where he finished the French baccalaureate in 2001; and Royal Military Academy Sandhurst, Camberley, England.
He began his higher education studies in the United Kingdom where he studied at University College, Durham and Brunel University, both in England. In 2006 he entered Institut Philanthropos in Fribourg, Switzerland, where he spent a year studying philosophy and anthropology.
He later studied letters and political science at the Institut Albert-le-Grand in Angers, receiving his bachelor's degree with honors in 2009. His degree was issued by Université d'Angers, as a result of a partnership agreement between the two schools.
From 2018 until 2019, Prince Guillaume attended a postgraduate training at the Royal College of Defence Studies (RCDS) in London.
