Prince Guillaume is the heir apparent to the throne of Luxembourg. Born on November 1, 1981, he is the eldest son of Grand Duke Henri and Grand Duchess Maria Teresa. He has a background in international relations and has served in various official capacities representing the Grand Duchy. As a member of the Luxembourg royal family, Prince Guillaume is involved in numerous charitable organizations and public engagements. He is married to Countess Stéphanie de Lannoy, and they have three children. His role includes promoting the interests of Luxembourg both domestically and internationally.