STORY: On the Proclamation Gallery, a balcony above Friary Court of St James's Palace, the Garter King of Arms, David White, accompanied by others in traditional heraldic outfits read out the Principal Proclamation, as trumpets sounded.
The death of 96-year-old Queen Elizabeth on Thursday (September 8) after 70 years on the throne set in train long-established and highly choreographed plans for days of national mourning and a state funeral that will be held in just over a week.
Charles, 73, immediately succeeded his mother but an Accession Council met on Saturday (September 10) to proclaim him king, with his son and heir William, wife Camilla and Britain's new prime minister, Liz Truss, among those to sign the proclamation.
Watching on at St James's - the most senior royal palace in the United Kingdom which was built by order of Henry VIII in the 1530s - were a few hundred people allowed into the court, including small children on parents' shoulders, a woman clutching flowers and the elderly on mobility scooters.
The proclamation was also set to be read publicly in the other capital cities of the United Kingdom - Edinburgh in Scotland, Belfast in Northern Ireland, and Cardiff in Wales - and at other locations, too.