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A historic Accession Council proclaimed as Britain's new king on Saturday following the death of his mother aged 96.

The televised council held at St James's Palace in London announced that "Prince Charles Philip Arthur George is now, by the death of our lady sovereign of happy memory, become our King Charles III... "

The 73-year-old automatically became monarch upon the queen's death Thursday, but an Accession Council ceremony at St James's Palace early Saturday is a constitutional formality to recognise his sovereignty.

Featuring trumpets and a balcony proclamation, the pomp-filled protocol is the latest part of a 10-day programme of official mourning -- which will last even longer for the royals -- held across Britain leading up to the queen's funeral.

An emotional Charles set the tone for his reign in a televised address Friday in which he hailed his mother's "unswerving devotion" during her record-breaking seven decades on the throne.

"Queen Elizabeth's was a life well lived, a promise with destiny kept, and she is mourned most deeply in her passing. That promise of lifelong service I renew to you all today," he said.

The speech dominated the front pages of Britain's newspapers on Saturday, with his heartfelt tribute to his "darling mama" headlining the Daily Telegraph, Daily Express, Daily Mail, The Sun, and Daily Star.

Charles looking pensive as he arrived at Buckingham Palace for the first time as king made the front page image on the Independent, Guardian and The Times, which also carried the words "God Save the King".

The new king also named his elder son and next heir Prince William, 40, as the new Prince of Wales, while expressing love for his younger son Harry and daughter-in-law Meghan.