The coronation of King Charles III and Queen Camilla

London's Metropolitan Police Service said it made dozens of arrests during King Charles III's coronation.

"We continue to engage with organisers of a static demonstration taking place in Trafalgar Square, close to the junction with Whitehall," it added.

Earlier on Saturday, several anti-monarchy protesters were arrested in central London ahead of the coronation of King Charles III on Saturday, the group said.

The Metropolitan Police force has faced scrutiny for its "robust" approach toward demonstrators at the historic event, and today's arrests come amid growing concern over the increase in law enforcement's power to stifle dissent in Britain, following the recent introduction of controversial pieces of legislation.

Nonprofit Human Rights Watch said the coronation arrests were "something you would expect to see in Moscow not London," according to a statement obtained by the UK's PA Media news agency.

"We absolutely understand public concern following the arrests," Cmdr. Karen Findlay said in a police news release.

"Our duty is to do so in a proportionate manner in line with relevant legislation. We also have a duty to intervene when protest becomes criminal and may cause serious disruption," Findlay said, adding that "the Coronation is a once in a generation event and that is a key consideration in our assessment."

Here's what protesters had to say about the monarchy:

CNN's Christian Edwards, Lindsay Isaac, Niamh Kennedy and Allegra Goodwin contributed reporting to this post.

Much has been made of the departures from tradition for the coronation of King Charles III — and this extended to the guest's dress codes. Gone were the requests for attendees to wear grand robes or ceremonial attire in favor of a more relaxed, pared-down look.

US first lady Jill Biden wore a periwinkle blue Ralph Lauren skirt suit, accessorized with a coordinating hair bow. She was accompanied by her granddaughter, Finnegan Biden, in a chic pale yellow cape dress by Markarian — in what could be seen as a sartorial nod to show solidarity with Ukraine. Inside the Abbey, the pair was seated next to Ukrainian first lady Olena Zelenska in an icy blue dress and coat pairing.

French luxury fashion house Dior said on Twitter that it was "honored to have dressed Prince Harry, Duke of Sussex, for the coronation of King Charles III in a custom design by Kim Jones."

Elsewhere, Australian musician Nick Cave looked chic in a classic three-piece black suit and Gucci horsebit loafers. Katy Perry (scheduled to headline the coronation concert in Windsor on Sunday) opted for a pink skirt suit and pearl choker by Vivienne Westwood — the late British designer who died in December 2022.

The distinctive necklace design may also be a nod to Queen Camilla's own fashion legacy. Camilla has numerous three-strand pearl pieces, including the aquamarine piece she has worn consistently since the 1990s.

Across the event, international royalty used the moment to celebrate their country's traditional garments. Crown Prince Akishino and Princess Kiko of Japan appeared in a morning suit and muted patterned silk kimono with an obi belt, respectively.

The theme of traditional dress was continued by King Jigme Khesar Namgyel Wangchuck and Queen Jetsun Pema of Bhutan. King Jigme Khesar wore a Bhutanese Gho, while Queen Jetsun Pema wore a lilac-colored kira — a customary wrap dress typical in Bhutan.

See more looks here.

King Charles III has been crowned in a coronation ceremony on Saturday. 

It got us wondering: Who were the other two "Charleses" who’ve served as king? Well, they didn't exactly have the calmest reigns. Here’s what we found:

Charles I: According to the British Royal Family’s website, the first Charles to ascend the throne did so in 1625. His reign, which ended in his beheading in 1649, was rather tumultuous.

Charles, a patron of the arts, also had "a stubborn belief that kings are intended by God to rule," according to Encyclopedia Brittanica.

He oversaw what became the English Civil Wars and married a Roman Catholic, with financial issues leading to tensions with Parliament. He ended up dismissing Parliament in its entirety in 1629 and ruled without it for 11 years. 

Twenty years later, the army decided he must be put on trial and executed. Charles was charged with treason, but did not recognize the legality of the High Court. On the scaffolding where his execution took place, Charles called himself "a martyr of the people."

He was not buried at Westminster Abbey, but at Windsor, "to avoid public disorder," according to the Royal Family site.  

Charles II: After the death of his father, Charles was invited to Scotland and proclaimed king. He fled to France when the Scots were defeated by English forces in 1651. After England and Scotland were united again, he was invited back to London to sit on the throne.

Known as the "Merry Monarch," Charles was "tall, handsome, sharp of mind, impeccably attired and charming," according to Royal Museums Greenwich.

He married Portugal's Catherine of Braganza, but the two spoke no common language and he continued to carry on affairs with a variety of mistresses, fathering at least 14 illegitimate children.

The devastating Great Fire of London in 1666 — which took out most of the city — and the Great Plague of London from 1665 to 1666 — in which at least 68,000 people succumbed to bubonic plague — occurred during his rule.

His later reign was "taken up mainly with attempts to settle religious dissension," according to the Royal Family site. 

He died of a stroke in 1685 and had no legitimate heirs.

US first lady Jill Biden attended the coronation of King Charles III Saturday, reflecting on the message sent by the ceremony.

"I thought about, really, the importance of traditions, the importance of oath," Biden said in a phone interview with CNN during her car ride from the coronation. "As I sat there, I felt this sense of decorum and civility that binds together people of all nations."

Biden said she was moved by the message of the Archbishop of Canterbury during the ceremony. 

"What he was saying to the people was that, really – people of all nations seek hope and joy. And I thought that was such a strong message, because I think that is true, and it’s true for all people everywhere. But I think it was important at this moment that the clergy brought that in to this moment in history," she said. 

Biden said she spoke with King Charles during a reception at Buckingham Palace on Friday, and that the King looked ahead to meeting with President Joe Biden at a later date, offering his regards. 

The first lady also spoke with Catherine, Princess of Wales, with whom she was photographed Friday evening. 

Biden has met with members of the royal family multiple times as first lady.

She said she was looking forward to high tea this afternoon with granddaughter Finnegan Biden, who joined her on the trip. Later Saturday, she will attend a private reception hosted by US Ambassador to the United Kingdom Jane Hartley. And on Sunday, she attends a lunch hosted by UK Prime Minister Rishi Sunak before returning to Washington. 

“It was so meaningful to me that I that I could bring Finnegan here, that we could travel together and experience this together. And it meant a lot to both of us,” she said. 

While the coronation weekend's main event might be over, the celebrations continue.

On Sunday, thousands of events and street parties are expected to take place across the country as part of the “Coronation Big Lunch.”

On Sunday evening, Lionel Richie, Katy Perry and Take That will headline the “Coronation Concert” at Windsor Castle. Ten locations around Britain will also be lit up with light displays, lasers and drones that evening.

Britons will then enjoy an extra day off on Monday, topping off the long weekend. The public has been encouraged to use the extra holiday to volunteer in their communities.

Here's how leaders around the world are marking the coronation of King Charles III and Queen Camilla.

US President Joe Biden congratulated the King and Queen, noting the "enduring friendship" between the United Kingdom and United States in a tweet.

French President Emmanuel Macron said King Charles III and Queen Camilla are "friends of France."

Proud to be by your side on this historic day," he tweeted in French.

President of the European Council Charles Michel extended his "best wishes" to King Charles III and Queen Camilla in a tweet, adding that the council appreciates the King's dedication to environmental efforts.

 "🇪🇺🇬🇧 friendship," he tweeted.

Irish Foreign Minister Micheál Martin congratulated the King and Queen on Coronation Day, "a very important day for many across these islands."

"We will continue to work in support of the bonds of friendship between our peoples and the strong connections we share," he said.

Finnish President Sauli Niinistö said "it was a great pleasure and honour" to be at the coronation in London.

"On behalf of Finland, we extended Their Majesties our very best wishes for a long and successful reign," he tweeted.

Italian Prime Minister Giorgia Meloni tweeted in Italian:

"The ancient Cosmatesque mosaic in Westminster Abbey, on which today the throne was placed for the coronation of King Charles III, was masterfully created by Italian craftsmen some eight centuries ago."

"Today it is still there to amaze the world, and to tell the story of the historic and fruitful cooperation between Italy and the United Kingdom, which we are sure with King Charles III - who once again reminded yesterday that he loves Italy - will further strengthen, as we have already begun to do with PM Rishi Sunak," she said.

"My best wishes to King Charles III, Queen Camilla and the entire British people," she concluded.

Switzerland President Alain Berset extended "best wishes for a long and happy reign 👑🇬🇧 " in a tweet.

French Foreign Minister Catherine Colonna tweeted: "God Save The King" 

NATO Secretary General Jens Stoltenberg was at the ceremony and said in a statement:

"His Majesty King Charles III has trained and served alongside military personnel, and is the Commander-in-Chief of the Royal Navy, British Army and Royal Air Force. Thousands of sailors, soldiers and aviators are marching together in the Coronation procession."

"The UK is a founding member of NATO and a strong and committed Ally, with a long history of stepping up to support Allies and partners," the statement said.

India Hicks, the second cousin and goddaughter of King Charles III, commended the monarch's handling of invitations to Saturday's coronation.

Hicks and her mother — Lady Pamela Mountbatten, who was a lady-in-waiting to Queen Elizabeth II — were not invited to attend the services, unlike previous coronations and royal events.

She called the move "absolutely brilliant" and said her mother's initial reaction was that His Majesty was "very sensible."

"It makes such a good impression on this time and this climate," Hicks said.

Some background: Around 2,300 people were sent invitations to the service at Westminster Abbey. While the palace doesn’t release a detailed guest list, it confirmed that the congregation was made up of members of the royal family, as well as international representatives from 203 countries, and community and charity volunteers.

Corgis were synonymous with Queen Elizabeth II's long reign, but a new dog breed is ready for its time on the throne: Cavalier King Charles Spaniels.

CNN's Anna Stewart attended a gathering on Coronation Day with 180 of the pups, with some donning their own small crowns, who braved the rain with their owners.

"They’re lovely dogs and they’re getting their day, which is really great," one proud owner told CNN.

With four children, eight grandchildren and 12 great-grandchildren, the late Queen Elizabeth II’s family appeared at events, on the Buckingham Palace balcony and in many official photographs, but rarely all together in public.

King Charles III’s coronation today offered one of our best chances to see the many royal family members assembled.

The King's two direct heirs, his son Prince William and grandson Prince George, both played official roles in the service.

Prince William swore fealty to his father, while 9-year-old Prince George was one of eight boys chosen to “attend Their Majesties during the Coronation Service,” the palace said.

Trying to keep all the royals straight after today's festivities? Check out this interactive family tree.

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