King Charles was officially proclaimed as Britain's new monarch on Saturday at a ceremony in St. James's Palace where former prime ministers, bishops and a host of politicians shouted "God Save The King."

The death of 96-year-old Queen Elizabeth on Thursday after 70 years on the throne set in motion 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, succeeded his mother immediately 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.