King Charles was officially proclaimed as Britain’s new monarch on Saturday at a ceremony in St. James’s Palace. The former Prince of Wales ‘Has become lawfully and rightfully Lord of Britain and Commonwealth’ on September 10.

Charles, 73, succeeded his mother, Queen Elizabeth II, immediately after her death on Thursday but an Accession Council met on Saturday to proclaim his succession, with his son and heir William, wife Camilla, and Britain’s new prime minister, Liz Truss, among those to sign the proclamation.

Making his personal declaration, Charles said: “My Lords, Ladies, and Gentlemen. It is my most sorrowful duty to announce to you the death of my beloved Mother, The Queen,” said Charles.

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“I know how deeply you, the entire Nation – and I think I may say the whole world – sympathise with me in the irreparable loss we have all suffered.”

“In carrying out the heavy task that has been laid upon me, and to which I now dedicate what remains to me of my life, I pray for the guidance and help of Almighty God.”

“In taking up these responsibilities, I shall strive to follow the inspiring example I have been set in upholding constitutional government and to seek the peace, harmony, and prosperity of the peoples of these Islands and of the Commonwealth Realms and Territories throughout the world.”

“In this purpose, I know that I shall be upheld by the affection and loyalty of the peoples whose Sovereign I have been called upon to be and that in the discharge of these duties I will be guided by the counsel of their elected parliaments.”

In his address, he bestowed upon Prince William and Kate Middleton the titles of the Prince of Wales and Princess of Wales.

Charles is now the King and head of state of the United Kingdom and 14 other realms including Australia, Canada, Jamaica, New Zealand, and Papua New Guinea.