Guillaume, Hereditary Grand Duke of Luxembourg Facts for Kids

Prince Guillaume, Hereditary Grand Duke of Luxembourg (born 11 November 1981) is the oldest child of Grand Duke Henri and Grand Duchess Maria Teresa. He is the heir apparent, meaning he is next in line to become the ruler of Luxembourg. He has been the heir since October 2000.

Since October 2024, Prince Guillaume has also been the regent of Luxembourg. This means he is temporarily in charge of the country. He is expected to become the Grand Duke on 3 October 2025, when his father steps down.

Early Life and Education
Becoming Hereditary Grand Duke
Marriage and Family Life
Hobbies and Skills
Titles and Style
- Honours
- Awards
  - Foreign
See also

Early Life and Education

Prince Guillaume was born in Luxembourg City on 11 November 1981. He is the first child of Grand Duke Henri and Grand Duchess Maria Teresa. He has four younger brothers and sisters: Prince Félix, Prince Louis, Princess Alexandra, and Prince Sébastien.

Guillaume went to school in Luxembourg and Switzerland. He finished high school in 2001. After that, he attended the Royal Military Academy Sandhurst in England. He also studied at universities in the United Kingdom and Switzerland. In 2009, he earned a bachelor's degree in letters and political science. From 2018 to 2019, he continued his studies at the Royal College of Defence Studies in London.

Before his higher education, Prince Guillaume completed internships at different companies. He worked at a chemical company, a bank, and a steel company. In 2002, he became an officer in the Luxembourg Army. He currently holds the rank of colonel.

Becoming Hereditary Grand Duke

Guillaume became the heir to the crown of Luxembourg in 2000. This happened when his father became the Grand Duke. When Guillaume becomes Grand Duke, he will be known as Guillaume V.

In 2001, Prince Guillaume became the honorary chairman of Luxembourg's Board of Economic Development. This group helps promote and grow the country's economy. He has also been a member of the Council of State since 2005. This council advises the government.

Prince Guillaume supports many different groups. He is a patron of the Luxembourg Cycling Sport Federation and Youth Hostels Central. He also supports the National Association of Road Victims and the Chamber Orchestra of Luxembourg. He is involved with Young Entrepreneurs Luxembourg and Special Olympics Luxembourg.

Guillaume has also done a lot of humanitarian work. In 1997, he helped with a reforestation project in Nepal. In 1999, he worked on a charity mission in Mexico. He helped young people in areas that needed support. For over 10 years, he led the Kräizbierg Foundation, which helps people with disabilities. He is now its honorary president.

In October 2024, Grand Duke Henri announced that Prince Guillaume would become the lieutenant representative. This means Guillaume started taking on some of his father's duties. These duties include swearing in ambassadors and signing official documents. This is usually the first step before a Grand Duke steps down. On Christmas Eve 2024, Grand Duke Henri announced he would step down on 3 October 2025.

Marriage and Family Life

On 26 April 2012, it was announced that Prince Guillaume would marry Countess Stéphanie de Lannoy from Belgium. Their civil wedding took place on 19 October 2012. The religious wedding was held the next day at the Notre-Dame Cathedral.

Guillaume and Stéphanie have two sons. Their first son, Prince Charles, was born on 10 May 2020. Their second son, Prince François, was born on 27 March 2023. Charles and François are second and third in line to the throne, after their father.

Hobbies and Skills

Prince Guillaume enjoys music and sports. He plays the piano and likes football, swimming, and volleyball. He can speak several languages, including Luxembourgish, French, German, Spanish, and English. He often represents his parents at events in other countries.

Titles and Style

Styles of The Hereditary Grand Duke of Luxembourg

Reference style	His Royal Highness
Spoken style	Your Royal Highness

Prince Guillaume's full title is: His Royal Highness Prince Guillaume Jean Joseph Marie, Hereditary Grand Duke of Luxembourg, Hereditary Prince of Nassau, Prince of Bourbon-Parma.

Honours

Country	Date	Appointment
Luxemburg	11 December 1999	Knight of the Order of the Gold Lion of the House of Nassau
	11 December 1999	Grand Cross of Order of Adolphe of Nassau
	23 June 2012	Grand Cross of the Order of the Oak Crown
Belgium		Grand Cross of the Order of the Crown
France		Grand Officer of the Order of the Legion of Honour
Italy		Knight Grand Cross of the Order of Merit of the Italian Republic
Netherlands		Knight Grand Cross of the Order of Orange-Nassau
Netherlands		Recipient of the King Willem-Alexander Inauguration Medal
Portugal	23 May 2017	Grand Cross of the Order of Aviz
Senegal	24 February 2023	Commander of the National Order of the Lion
Slovakia		Grand Officer of the Order of the White Double Cross
United Kingdom	22 September 2020	Recipient of the Sandhurst Medal