King Charles III was formally proclaimed as monarch on Saturday hours before Buckingham Palace announced Queen Elizabeth II's state funeral will be held Sept. 19. 

The accession ceremony at St James's Palace in London officially marks a new era in British rule following Queen Elizabeth's death Thursday.

Though Charles automatically became king after his mother's death, he was officially announced as Britain's new king Saturday in a ceremony steeped in ancient tradition and political symbolism — and, for the first time, broadcast live.

David White, the Garter King of Arms, made the king's proclamation official while flanked by trumpeters in gold-trimmed robes before leading cheers — “hip, hip, hooray!” — for the new king.