It is diplomatic protocol for Heads of State to send a message of congratulations to the new Head of State of countries they have close relations with. This is not always done with a public statement; statements are often sent directly to the new head of state. So, we might not see statements from each Monarchy.
Europe
Belgium
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Denmark
The Grand Duchy of Luxembourg has today carried out a change of throne, and on this occasion Their Majesties the King and Queen have sent their warmest congratulations to His Royal Highness Grand Duke Guillaume and Her Royal Highness Grand Duchess Stéphanie.
Liechtenstein
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Monaco
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Netherlands
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Norway
Your Royal Highnesses,
Dear Guillaume and Stéphanie
My family and I send you our warmest congratulations and best wishes as the new Grand Duke and Grand Duchess of Luxembourg.
You follow in the footsteps of our good friends Henri and Maria Teresa, who have served Luxembourg and its people with great love and duty for 25 years.
Now it is your family, with their sons Prince Charles and Prince François, who will follow your country and people into the future. I am confident that you will carry out your task in an excellent manner.
My family and I greatly appreciate the close ties between us. We hope that you will experience the support and strength you need in your work.
Harald R
Spain
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Sweden
His Royal Highness The Grand Duke of Luxembourg
Palais grand-ducal
LUXEMBOURG
On the occasion of your assuming the high office of Grand Duke of Luxembourg, I extend to you, and to Grand Duchess Stéphanie, my sincere congratulations.
In recent years I have highly valued our cooperation within the World Scout Foundation, in which you have followed in the footsteps of your grandfather, Grand Duke Jean.
As you now succeed your father, Grand Duke Henri, as your nation’s Head of State, I look forward to further deepening the ties between us and between our two countries.
I send my best wishes for the health and happiness of Your Royal Highness and your Family, and for the well-being and prosperity of the people of Luxembourg.
CARL GUSTAF R
Royal Palace, Stockholm
3 October 2025
UK
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Middle East
Bahrain
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Jordan-
Kuwait
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Oman
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Qatar
Saudi Arabia
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United Arab Emirates-
Africa
Cambodia-
Lesotho
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Morocco
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Malaysia
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Brunei
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Japan
Your Royal Highness,
On the auspicious occasion of Your Royal Highness' Accession to the Throne as Grand Duke of Luxembourg, I take great pleasure in extending, on behalf of the people of Thailand, our warmest congratulations and best wishes for your good health and enduring success upon the assumption of Your Royal Highness' duties and responsibilities of state.
The strong bonds of friendship between Thailand and Luxembourg have been constructive and mutually beneficial based on trust and understanding for over sixty years of diplomatic relations. As your gracious reign begins, I firmly believe that our two countries will continue working closely together, building on our past achievements and further strengthening our friendly cooperation, underpinned, of course, by the close affinity between our Royal Families. The path ahead holds great promise for the shared prosperity and mutual benefit of our two countries and peoples.
(M.R.) Maha Vajiralongkorn R.
Tonga-
