When the King and Queen were crowned in Westminster Abbey, the height of flag-waving, pomp and pageantry took place in central London.
Thousands gathered for their chance to catch a glimpse of the royals – although a series of protests from Just Stop Oil, Animal Rising and Republic punctuated the celebrations.
Elsewhere in the four nations of the United Kingdom, people marked the coronation in their very own way.
In Wales, thousands gathered at Cardiff Castle to see the ceremony.
Pop-up stands selling flags are a common sight on match days in Cardiff, but both Union flags and Welsh flags were sold today – a sign that the day was different.
Despite the wet conditions underfoot, crowds gathered to watch the ceremony, which featured performances in Welsh for the first time.
After the King’s coronation, a gun salute by the Royal Artillery of the 104th Regiment was heard at 12.01.
This was followed by a performance by the Regimental Band of the Royal Welsh, who marched through the castle grounds.
Outside the castle, hundreds gathered with placards and banners, and chants of “Nid fy mrenin” and “Not my king” could be heard.
The protest featured representatives from groups such as Cymru Republic and Republic UK, as well as a range of political parties and contributions from guest speakers.
One of the speakers, Adam Johannes of the People’s Assembly Cardiff, described Wales as ‘the republican heartland of this island’.
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A similar tone was felt in Scotland, a country divided by monarchy. A recent poll found almost three quarters of Scots do not support this coronation event.
Thousands of Scottish independence supporters marched through Glasgow – the largest mass gathering in Scotland today.
Saltire flags flew high in the sky as people chanted “not my king” and “shove your coronation up your ass”.
People were in good spirits, but there was a clear signal that this is a nation with a different emotional strength, despite the deep royal connection to Royal Deeside – the place where the late Queen died and where the royal family has spent heavily of the time at Balmoral.
A 21-gun salute was sounded from Hillsborough Castle outside Belfast to mark the King’s coronation.
Members of the Hillsborough Fort Guard welcomed guests to a marquee in the grounds of the castle, the royal residence in Northern Ireland.
About 2,000 people gathered to watch the coronation service live on a large screen.
When Charles was crowned in Westminster Abbey, the guns were fired by reservists from Battery 206 (Ulster) of the 105th Regiment of the Royal Artillery.
Elsewhere, crowds gathered to watch the ceremony live from public screens across Northern Ireland.
The coronation was broadcast to viewers at Belfast City Hall, Antrim Castle Gardens, Jordanstown Loughshore Park, Coleraine Town Hall and Market Square in Lisburn.
Further south in the Republic of Ireland, the mood was more subdued – perhaps summed up by this solo man having a pint in a Dublin pub while the ceremony was broadcast in the background.