Prince Guillaume was born on 11 November 1981 and was officially named Hereditary Grand Duke on 18 December 2000.

Prince Guillaume is the oldest child of Grand Duchess Maria Teresa and Grand Duke Henri. On 19 October 2012, he married Countess Séphanie de Lannoy.

The couple spent the years 2018 and 2019 living in London to conclude their post-university studies. Prince Guillaume was able to finish his training at the Royal College of Defence Studies, preparing him for his future role as Grand Duke, this year. The training is a continuation of the studies that the monarch already followed at the Royal Military Academy Sandhurst in 2001.

Prince Guillaume first became a father on 10 May 2020. At 5.13 a.m., Charles Jean Philippe Joseph Marie Guillaume was born at the Grand Duchess Charlotte maternity wing in Luxembourg City.


© Cour grand-ducale / Marion Dessard