King Charles succeeded his mother Queen Elizabeth when she died last September and at 74, he became the oldest British monarch in Britain's first coronation in 70 years as the monarchy faces challenges ahead.
In front of a congregation of about 100 world leaders and a television audience of millions, the Archbishop of Canterbury, the spiritual leader of the Anglican Church, slowly placed the 360-year-old St Edward's Crown on Charles' head as he sat upon a 14th-century throne in Westminster Abbey.
Along with Britain, Charles has become head of the Commonwealth, an association of 56 independent countries and 2.5 billion people. For 14 of these countries, as well as the UK, the King is head of state.
In one of the most eagerly-awaited moments of the Coronation day, UK's newly-crowned King Charles III and Queen Camilla stepped out onto the Buckingham Palace balcony and waved to thousands of flag-waving people on Saturday. The king appeared on the balcony of Buckingham Palace in a made-for-television moment in his royal robes and Imperial State Crown, after a gilded carriage brought him back from Westminster Abbey on a day of pomp and pageantry in London.
A fly-past by military jets to celebrate the coronation of King Charles has been scaled back due to weather conditions, a spokesperson for the Ministry of Defence said on Saturday.
With low cloud and rain over Buckingham Palace, the fly-past due at 1330 GMT will now feature helicopters and the Red Arrows aerobatic team.
King Charles and Queen Camilla returned to Buckingham Palace on Saturday following their coronation at Westminster Abbey and a lengthy military procession.
The couple will later be joined by the royal family on the balcony.
From traditional robes to statement headpieces, royals and guests wore an array of colourful outfits for the coronation of Britain's King Charles III on Saturday, filling London's Westminster Abbey with a mix of hues and designs.
The monarch arrived in the crimson velvet Robe of State, worn by his grandfather King George VI at his 1937 coronation, a crimson coronation tunic and cream silk overshirt with royal naval trousers.
He changed into ceremonial regalia worn by his predecessors to be crowned: the gold-silk full-length Supertunica coat and the Coronation Sword Belt, and over that the gold cloth Imperial Mantle, originally made for the coronation of George IV in 1821 and the oldest vestment in the service. A white leather glove embroidered with gilt metal thread was placed onto his right hand.
Prince Harry, the younger son of King Charles III, attended his father's coronation in Westminster Abbey on Saturday although he had to settle for a third-row seat behind other members of the royal family.
Harry, 38, was smiling as he arrived at the abbey dressed in a morning suit and with medals on his chest. The prince is an army veteran who served in Afghanistan.
King Charles III became the 40th British monarch to be crowned at Westminster Abbey on the historic date May 6, 2023.
The king was surrounded by heavy symbolism of his many passions, including a drive towards more sustainable living, a multi-faith outlook and a great love for India and the wider Commonwealth.
At the end of the service, he will receive a spoken greeting delivered in unison by representatives from Hindu, Sikh, Muslim, Buddhist and Jewish communities.
