At the meeting of the Council of State at Christiansborg Palace on 14 November 2023, HRH Prince Christian signed the so-called solemn declaration on abiding by the Constitution.

It is a requirement that Prince Christian makes a solemn declaration of his intention to abide by the Constitution before the Prince will be able to be appointed as regent in the event that both HM The Queen and HRH The Crown Prince are prevented from governing. Already, TRH The Crown Princess, Princess Benedikte and Prince Joachim can assume the function of regent and thus perform the duties of head of state.

After Prince Christian, in the presence of The Queen, The Crown Prince and the government, made his solemn declaration, for the first time in more than 100 years there will be a situation in which there are both a successor to the throne and an heir to the throne of legal age who can step in as regent. When both The Queen and The Crown Prince witnessed Prince Christian making his solemn declaration at the Council of State on 14 November 2023, it was thus presumably the first time in the history of the Constitution that three generations in the line of succession were present in the Council of State at the same time.

After the Council of State Prince Christian photographed with The Queen, The Crown Prince Couple and the government at Christiansborg Palace.