Overview
- Henri signed the abdication act at the Grand Ducal Palace around 10:00, followed by Guillaume’s oath near 11:00, a flag change, a 21‑gun salute and a balcony appearance.
- Guillaume pledged to respect the Constitution and to remain politically neutral, delivering his oath and remarks in Luxembourgish, French and German with calls for a united Europe.
- The Dutch and Belgian monarchs attended with heirs Amalia and Elisabeth, while EU chiefs Ursula von der Leyen and Charles Michel joined other royals and dignitaries.
- Evening events included a gala, with further celebrations scheduled through the “Trounwiessel” weekend featuring a countrywide tour, performances at Champ du Glacis and the new duke’s first address.
- Prince Charles, 5, became heir to the throne and is described as Europe’s youngest heir, with his brother François second in line; a Te Deum at Notre‑Dame Cathedral on Sunday is to be led by Cardinal Jean‑Claude Hollerich.