Prince Guillaume celebrated his 37th birthday on Sunday, 11 November 2018, when many people commemorated the Centenary of Armistice Day.
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 was named after his uncle, Prince Guillaume of Luxembourg, his father’s youngest brother.
He has three younger brothers, Prince Felix (b 1984), Prince Louis (b 1986) and Prince Sebastian (b 1992) and sister Princess Alexandra (b 1991).
Prince Guillaume officially became the Hereditary Grand Duke on 18 December 2009, shortly after his father’s accession to the Grand Ducal throne.
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 married Belgian Countess Stéphanie de Lannoy at the Notre Dame Cathedral in Luxembourg City in October 2012.
They moved to London whilst Prince Guillaume completes a post-graduate training course at the Royal College of Defence Studies (RCDS).
He regularly represents his parents on official visits to foreign countries.
Prince Guillaume loves 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.
The Prince enjoys skiing, swimming and water sports and plays tennis and he speaks Luxembourgish, French, German, Spanish and English.
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