The Council of Succession officially proclaimed Charles III the new King of Great Britain, reports the BBC..

The proclamation was signed by the heir to the throne, Prince William, Queen Consort Camilla, Leader of the House of Commons and Lord President of the Council, Penny Mordaunt, and Prime Minister Liz Truss and the Archbishop of Canterbury..

Former British Prime Ministers present include John Major, Gordon Brown, Boris Johnson, David Cameron, Theresa May and Tony Blair.. Also attending the ceremony was the leader of the British opposition, the Labor Party, Keir Starmer..

73-year-old Charles III became the oldest king at the time of the beginning of the reign in the history of Britain.

In his speech, Charles III declared that he accepted the responsibility and duties as a sovereign. The new king also promised to promote peace, harmony and prosperity for his subjects..

The son of Queen Elizabeth II, who passed away on September 8, also took the traditional oath during the ceremony.

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Charles is the eldest son of the late Queen and was first on the list of contenders for the British royal throne.. His full name is Charles Philip Arthur George.. The new king was educated at school and gymnasium, after which he entered the University of Cambridge, where he received a Bachelor of Arts degree.. During 1971-1976 Charles served in the Royal Air Force and the Royal Navy..

He also condemned Russia's full-scale invasion of Ukraine and expressed support for the Ukrainians.. Usually members of the British royal family do not speak out on political issues and remain neutral..

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Charles III automatically became King of the United Kingdom and head of 14 other states, including Canada, after his mother, Queen Elizabeth, died at the age of 96..

The ceremony of proclaiming the accession to the Canadian throne of British King Charles III will also be held in Ottawa.

Prime Minister Justin Trudeau and members of the federal cabinet and Privy Council are expected to meet as part of the protocol needed to formally proclaim a new sovereign..