Charles III has officially been proclaimed king in a historic ceremony in St James’s Palace on Saturday.
The ceremony comes days after Queen Elizabeth II died on Thursday aged 96 at Balmoral Castle in Scotland.
He pledged to emulate his late mother Queen Elizabeth II and serve for the rest of his life.
He said, “I am deeply aware of this great inheritance and of the duties and heavy responsibilities of sovereignty, which have now passed to me,” in a speech before swearing the oath.
UK Prime Minister Liz Truss and senior members of her government have also taken oaths of loyalty to King Charles III in the House of Commons.
Charles is king and head of state not only of the United Kingdom but of 14 other realms including Australia, Canada, Jamaica, New Zealand and Papua New Guinea.