Two days after his mother’s death elevated him to the throne, King Charles III was officially proclaimed Britain’s monarch Saturday in a pomp-filled ceremony steeped in ancient tradition and political symbolism — and, for the first time, broadcast live online and on air.

Charles, who spent seven decades as heir apparent, automatically became king when his mother, Queen Elizabeth II, died on Thursday. But the accession ceremony was a key constitutional and ceremonial step in introducing the new monarch to the country, a relic of a time before mass communications.

Scores of senior British politicians past and present, including new Prime Minister Liz Truss and five of her predecessors, gathered in the ornate state apartments at St. James’s Palace for the meeting of the Accession Council.

They met without Charles, officially confirming his title, King Charles III. The king then joined them, vowing to follow his mother’s “inspiring example” as he took on the duties of monarch.

“I am deeply aware of this great inheritance and of the duties and heavy responsibilities of sovereignty which have now passed to me,” he said.

Speaking of his personal grief, he said: “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.”