From left, Labour leader Sir Keir Starmer, former prime ministers Tony Blair, Gordon Brown, Boris Johnson, David Cameron, Theresa May and John Major ahead of the Accession Council ceremony at St James's Palace, London, September 10, 2022, where King Charles III is formally proclaimed monarch. KIRSTY O'CONNOR/AP

King Charles III, the world's newest monarch, was officially proclaimed sovereign of the United Kingdom of Great Britain and Northern Ireland on Saturday morning in a constitutional ceremony that dates back hundreds of years. Almost 700 members of the current Accession Council, the oldest functioning part of Britain's government, were called to convene Saturday at St James's Palace in London, the official residence of the U.K.'s kings and queens for centuries.

King Charles III pledges "lifelong service" in 1st address
The council is comprised of Privy Counsellors, a select group of senior politicians, including new Prime Minister Liz Truss, religious figures from the Church of England, the Lord Mayor of London and a bevy of other top civil servants from across British society and the 14 other "realms," or nations, for which the monarch serves as the official head of state.

While King Charles III immediately became the king upon the death of his mother, Queen Elizabeth II, who died Thursday after a record 70 years on the throne, it was the council's role to formally acknowledge the passing of one monarch and to then proclaim the new one on behalf of the British government. It is part of Britain's constitutional process.

Around 200 of the current Privy Counsellors attended the proceedings in London on Saturday, including many former prime ministers and other senior politicians. The Privy Council is the oldest functioning part of Britain's government, dating back almost 1,000 years. For the first time in the Accession Council's long history, the two-part ceremony was aired live on television Saturday.

In the first part of the ceremony, British lawmaker Penny Mordaunt, the Lord President of the council, announced the death of Queen Elizabeth II and then clerk of the council, Richard Tilbrook, read out loud a proclamation of accession.

The proclamation was then signed by members of the council.

For the second part of the council, King Charles joined the gathering at St James's. The Privy Counsellors watched as the new monarch read out declarations relating to his mother's death, and then swore an oath vowing to serve his kingdom.

Pledging to follow his mother's "inspiring example," Charles said he was "deeply aware of this great inheritance and of the duties and heavy responsibilities of sovereignty which have now passed to me."

"I know how deeply you and the entire nation, and I think I may say the whole world, sympathize with me in this irreparable loss we have all suffered," he said of the queen's passing.

The new king then vocally approved a number of orders, including declaring the still-unconfirmed date of his mother's funeral a national holiday. It is expected to be held on or around September 19.

As required by Britain's constitution, Charles also declared to serve loyally the Church of Scotland, of which he is also the formal leader. He was then first to sign two copies of that declaration, followed by his son and heir, William, Prince of Wales, and other witnesses.

Following the Accession Council proceedings, the proclamation of King Charles as the monarch was read out loud from the Proclamation Gallery, a balcony of St James's Palace, by the Garter King of Arms, accompanied by other officials — all wearing traditional clothing.

Trumpets blared as the Garter King of Arms prepared to read the proclamation.

The proclamation, as read out to the world by the Garter King of Arms, saw the assembled Privy Counsellors and other members of the Accession Council formally declare that they "do now hereby with one voice and Consent of Tongue and Heart, publish and proclaim that the Prince Charles Philip Arthur George is now, by the death of our late Sovereign of happy memory, become our only lawful and rightful liege lord, Charles the III, by the Grace of God, of the United Kingdom of Great Britain and Northern Ireland and of all His other Realms and Territories, King, Head of the Commonwealth, Defender of the Faith, to whom we do acknowledge all Faith and Obedience with humble Affection, beseeching God by whom Kings and Queens do reign, to bless his majesty with long and happy Years to reign over us."

Afterward, another trumpet salute followed a cry of "God save the king!" by those gathered in the courtyard under the Proclamation Gallery. The assembled crowed then sang the British national anthem, with its newly revised lyrics of "God save the king."

The ceremony was to be followed later in the day by gun salutes, and public repetitions of the proclamation at other locations in London and then in the capital cities of the United Kingdom's other home nations, in Edinburgh, Scotland; Belfast, Northern Ireland, and Cardiff, Wales, among other locations across the 14 nations where Charles is the formal head of state.

The rest of King Charles' third day on the job will involve a range of formal meetings — or "audiences," as they're referred to by Buckingham Palace — with officials including the Archbishop of Canterbury, the prime minister and other members of the cabinet, and then leaders of Britain's political opposition parties.


William, Prince of Wales (left), Queen Consort Camilla (2nd left), Penny Mordaunt, Lord President of the Accession Council, and Britain's Prime Minister Liz Truss (4th from left), look on as other members of the Accession Council sign a formal proclamation confirming the beginning of King Charles III's reign. CBS NEWS VIA BBC

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