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Britain’s King Charles III has been crowned in a once-in-a-generation royal event witnessed by hundreds of high-profile guests inside Westminster Abbey, as well as tens of thousands of well-wishers who gathered in central London despite the rain.

While Charles became King on the death of his mother, Queen Elizabeth II last September, the coronation on Saturday was the formal crowning of the monarch.

The service was a profoundly religious affair, reflecting the fact that aside from being head of state of the United Kingdom and 14 other countries, Charles is also the Supreme Governor of the Church of England.

In the most significant moment of the day, Archbishop of Canterbury Justin Welby placed the 360-year-old St. Edward’s Crown on Charles’ head. The spiritual leader of the Anglican Church then declared: “God Save the King.”

The intricate service lasted just over two hours – about an hour shorter than Elizabeth II’s coronation in 1953 – and followed a traditional template that has stayed much the same for more than 1,000 years.

However, it has been modernized in certain key ways. The archbishop acknowledged the multiple faiths observed in the UK during the ceremony, saying the Church of England “will seek to foster an environment in which people of all faiths may live freely.”

05:02 - Source: CNN
British royal titles, explained

The King took the Coronation Oath and became the first monarch to pray aloud at his coronation. In his prayer he asked to “be a blessing” to people “of every faith and conviction.”

In what is considered the most sacred part of the ceremony, the King was anointed with holy oil by the Archbishop of Canterbury. He was also presented with the coronation regalia, including the royal Robe and Stole, in what is known as the investiture part of the service.

Then, for the first time in coronation history, the archbishop invited the British public, as well as those from “other Realms,” to recite a pledge of allegiance to the newly crowned monarch and his “heirs and successors.”

Ahead of the event, some parts of the British media and public interpreted the invitation as a command, reporting that people had been “asked” and “called” to swear allegiance to the King. In the face of such criticism, the Church of England revised the text of the liturgy so that members of the public would be given a choice between saying simply “God save King Charles” or reciting the full pledge of allegiance.

Hugo Burnand/Royal Household 2023/AP
Britain's King Charles III poses for a portrait in Buckingham Palace's Throne Room dressed in full regalia. He is wearing the Robe of Estate and the Imperial State Crown while holding the Sovereign's Orb and the Sovereign's Sceptre with Cross.
Emilio Morenatti/AP
A storefront window in London is decorated with framed photographs and a painting of the King on Thursday.
Charles McQuillan/Getty Images
Westminster staff and police take cover from the rain on Friday.
Toby Melville/Pool/Reuters
The King meets well-wishers outside Buckingham Palace during a walkabout on Friday.
Emilio Morenatti/AP
A royal fan sleeps along the procession route on Friday.
Sarah Tilotta/CNN
People travel into London on Saturday to be a part of the historic day.
Toby Hancock/CNN
Preparations are made on the balcony of Buckingham Palace.
Sarah Tilotta/CNN
A child has paint applied to his face while waiting for the procession.
Marco Bertoorello/AFP/Getty Images
Members of the Coldstream Guards march on the procession route before the coronation.
Toby Hancock/CNN
People gather to watch the procession. Showers moved through London on Friday and more rain was expected for Saturday.
Sarah Tilotta/CNN
People wait on the procession route ahead of the coronation.
Sarah Tilotta/CNN
Troops march in London ahead of the coronation ceremony.
Toby Hancock/CNN
The King's carriage leaves Buckingham Palace before the coronation.
Phil Noble/Pool/Reuters
Order-of-service booklets are seen at Westminster Abbey as guests arrive for the coronation.
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Members of the public look out onto Parliament Square ahead of the coronation.
Yara Nardi/Pool/Reuters
Police officers detain a protester ahead of the King's procession. Several arrests were made Saturday as protesters gathered near the procession route.
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A boy watches guards march on the streets in front of Big Ben.
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The King and Queen travel in the Diamond Jubilee State Coach as they make their short journey from Buckingham Palace to Westminster Abbey.
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People line the procession route in London.
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Jill Biden, first lady of the United States, arrives at Westminster Abbey. Biden, who led the US delegation, traveled with her granddaughter Finnegan Biden.
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The procession takes place in London before the coronation.
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Singer Katy Perry takes a selfie with guests at Westminster Abbey. The coronation guests included celebrities and world leaders.
Charles McQuillan/Pool/Reuters
Royal Navy sailors stand at attention on the Mall in London.
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Musicians perform at Westminster Abbey before the coronation ceremony.
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Singer Lionel Richie poses for a selfie at Westminster Abbey.
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Prince George, second from left, stands with other pages of honor at Westminster Abbey.
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Prince Harry, right, arrives at Westminster Abbey along with Princess Beatrice, one of the King's nieces, and her husband, Edoardo Mapelli Mozzi. Harry accepted the invitation to his father's coronation but was without his wife, Meghan, who stayed back in California with the couple's two children.
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The King and Queen travel to Westminstger Abbey in the Diamond Jubilee State Coach.
Henry Nicholls/Reuters
The King is seen near his grandson Prince George, one of his pages of honor.
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Prince Harry enters Westminster Abbey.
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Former British prime ministers Tony Blair, Gordon Brown, David Cameron, Theresa May, Boris Johnson and Liz Truss sit with their partners.
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Prince Louis and Princess Charlotte, two of the King's grandchildren, arrive for the coronation.
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Prince William, Harry's brother, and Catherine, the Princess of Wales, arrive for the coronation with Prince Louis and Princess Charlotte.
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The King enters Westminster Abbey for his coronation.
Andrew Matthews/Pool/Reuters
The King arrives at Westminster Abbey for his coronation.
Emilio Morenatti/AP
People watch the ceremony on a screen in Hyde Park.
Phil Noble/Pool/Reuters
The King and Queen entered the Abbey to the strains of "I was glad," the stirring coronation anthem written by Hubert Parry for the coronation of King Edward VII in 1902. It has been sung at all coronations since then.
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The King and Queen take part in the coronation ceremony.
Richard Pohle/Pool/AP
Prince Harry looks around Westminster Abbey from his spot in the third row. He is a non-working royal and did not perform any duties during the ceremony.
Yui Mok/PA/AP
An anointing screen is erected for King Charles III at the coronation ceremony. The most sacred part of the service — the anointing — took place behind the screen.
Yui Mok/Pool/Reuters
The King places his hands on the Coronation Bible as he takes the Coronation Oath.
Phil Noble/Pool/Reuters
Guests watch the coronation ceremony at Westminster Abbey.
Phil Noble/Pool/Reuters
The St. Edward's Crown is carried inside Westminster Abbey.
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The King holds a sword during the ceremony.
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Prince Louis points out something to his sister, Princess Charlotte, during the ceremony. They are flanked by their parents, Prince William and Catherine, the Princess of Wales.
Aaron Chown/Pool/Reuters
The Archbishop of Canterbury Justin Welby places the St. Edward's Crown onto the head of the King.
Emilio Morenatti/AP
Royal fan Ben Weller reacts as he watches the coronation on a screen in London's Hyde Park.
Jonathan Brady/Pool/AFP/Getty Images
This was the only time Charles will ever wear St. Edward's Crown, as it is reserved for the coronation of a new monarch.
Andrew Matthews/Pool/AP
The King wears the St. Edward's Crown during his coronation.
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The King's son Prince William, the heir apparent to the throne, kisses his father on the cheek during the ceremony.
Yui Mok/Pool/AP
British lawmaker Penny Mordaunt carries the Sword of State during the coronation. She was involved in the ceremony because as the current Leader of the House of Commons, she is also the Lord President of the Privy Council — a body formed of senior politicians who act as the monarch's official advisers.
Sarah Tilotta/CNN
People in London's Piccadilly Circus walk past a giant screen showing an image of the King during the coronation ceremony.
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The Queen receives her own coronation. She wore the Queen Mary's Crown.
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Charles and Camilla walk out of Westminster Abbey.
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The King greets multifaith leaders on his way out of Westminster Abbey.
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The Queen walks toward the Gold State Coach after leaving Westminster Abbey.
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Prince Harry leaves Westminster Abbey after the ceremony. He did not join members of his family to ride in an impressive procession back to the palace. Instead, he got into a car alone and departed the abbey shortly after the service had ended.
Sarah Tilotta/CNN
Troops march in London for the King's coronation. On their way back to Buckingham Palace, the King and Queen were accompanied by a huge parade of soldiers, musicians and horses.
Toby Hancock/CNN
The King and Queen travel to Buckingham Palace in the Gold State Coach after the ceremony at Westminster Abbey.
Carl Court/Pool/AP
The Gold State Coach carries the King and Queen back to Buckingham Palace.
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A horse, apparently spooked, rears back into a crowd and crashes into a barrier during the procession. The animal was quickly brought back under control.
Toby Hancock/CNN
Prince William heads back to Buckingham Palace with Catherine and their three children: Louis, George and Charlotte.
Sarah Tilotta/CNN
Military groups take part in the parade from Westminster Abbey to Buckingham Palace.
Mosa'ab Elshamy/AP
The procession passes anti-monarchy protesters.
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The Gold State Coach that carried the King and Queen is incredibly heavy, weighing 4 tons. Because of its weight, it can travel only at a walking pace.
Peter Byrne/Pool/AP
The King and Queen arrive at the palace to receive a royal salute from members of the military.
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The King and Queen appear on the Buckingham Palace balcony with various members of the royal family following their coronation.
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The Red Arrows, the aerobatics display team of the Royal Air Force, fly over Buckingham Palace as members of the public watch nearby.
Hannah McKay/Reuters
Some members of the royal family appear on the palace balcony after the coronation. From left are Sophie, Duchess of Edinburgh; Princess Charlotte; Princess Anne; Catherine, Princess of Wales; Prince Louis; Prince William; and Oliver Cholmondeley.
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The crowd outside Buckingham Palace watches the Red Arrows fly by as the royals stand on the balcony.
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The King's eldest grandson, Prince George, stands on the palace balcony between two other boys who like him served as pages of honor for the coronation: Oliver Cholmondeley, left, and Nicholas Barclay.
Chris Jackson/Pool/AP
The King and Queen wave to people from the palace balcony.
Leon Neal/Pool/AP
The King and Queen look at each other on the balcony. They gave an encore wave to the crowd after initially going back inside.
Hugo Burnand/Royal Household 2023/AP
The King and Queen pose for a portrait flanked by "working royals" — members of the family who carry out official duties on behalf of the monarch.
Emilio Morenatti/AP
Musicians play while people take part in the "Coronation Big Lunch" in London on Sunday. Thousands of community events took place across the country to commemorate the King's coronation.
Jordan Pettitt/PA/AP
US first lady Jill Biden and British Prime Minister Rishi Sunak speak during a "Coronation Big Lunch" event on Downing Street.
Kirsty Wigglesworth/AP
Sylvia Daw leaves her cottage to celebrate in Alfriston, England.
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Princess Anne, the King's sister, presents a young girl with a commemorative tin of old coins during celebrations in Swindon, England.
Leon Neal/Pool/AFP/Getty Images
The crowd inside the Windsor Castle grounds waves flags as Sunday's "Coronation Concert" gets underway.
Abbie Trayler-Smith for CNN
A child sleeps on a makeshift throne at a street party in London's Brixton district.
Yui Mok/Pool/Reuters
Lionel Richie performs on the castle grounds. He performed his hit songs "Easy" and "All Night Long (All Night)."
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Katy Perry dedicated her song "Firework" to King Charles.
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From left, Prince William, Queen Camilla, King Charles and Baroness Patricia Scotland attend the concert.
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Gary Barlow, Howard Donald and Mark Owen of '90s British pop group Take That perform backed by military drummers.
Yui Mok/Pool/Getty Images
Prince William speaks on stage. "I want to say a few words about my father, and why I believe this weekend is so important," he said. "But don't worry, unlike Lionel, I won't go on all night long."
Carl Recine/Reuters
The Blackpool Tower in England is illuminated to mark the King's coronation.

The ceremony also included a reading from the Bible by UK Prime Minister Rishi Sunak and, in another coronation first, gospel music.

Once the King was crowned, his wife, Queen Camilla, was crowned in her own, shorter ceremony with Queen Mary’s Crown – marking the first time in recent history that a new crown wasn’t made specifically for this occasion.

Music played a central part in the proceedings, and five new compositions were commissioned for the main part of the service, including an anthem by Lloyd Webber, who is better known for West End musicals.

Charles and Camilla arrived at Westminster Abbey in a splendid coach drawn by six horses, accompanied by the Household Cavalry.

02:38 - Source: CNN
Watch King Charles and Queen Camilla set off in coach to coronation

After the ceremony, the newly crowned King and Queen rode back to Buckingham Palace in a much larger parade, featuring 4,000 members of the armed forces, 250 horses and 19 military bands.

The pomp and pageantry concluded with a royal salute and the customary balcony appearance by the King and family members. They and the crowds below watched a flypast of military aircraft, slimmed down because of the poor weather.

Jonathan Brady/Pool/AFP/Getty Images
The Archbishop of Canterbury Justin Welby places the St Edward's Crown onto the head of King Charles III.

Star-studded guest list

Some royal fans spent several days camping along the 1.3-mile (2km) route from Buckingham Palace, the British monarchy’s official London residence, to Westminster Abbey, the nation’s coronation church since 1066, in order to secure the best vantage point.

By early Saturday, the London Metropolitan Police Service announced that all viewing areas along the procession route were full and closed off to new arrivals.

The congregation, while including some 2,300 people, was much smaller than it was in 1953 when temporary structures had to be erected within the abbey to accommodate the more than 8,000 people on the guest list.

The doors to the abbey opened just before 8 a.m. local time and quickly started to fill up. Many of the guests, including top British officials, faith leaders and international representatives, were expected to take their seats more than an hour before the ceremony started – reflecting the huge logistical challenges presented by an event attended by hundreds of VIPs.

The guest list was a Who’s Who of British public life and politics: All Sunak’s living predecessors as prime minister were there: Liz Truss, Boris Johnson, Theresa May, David Cameron, Gordon Brown, Tony Blair and John Major.

Mayor of London Sadiq Khan, UK opposition leader Keir Starmer and Chancellor of the Exchequer Jeremy Hunt were also in attendance.

Approximately 100 of heads of states from around the world and dozens of members of foreign royal families traveled to London for the occasion.

Canadian Prime Minister Justin Trudeau, Australian Prime Minister Anthony Albanese, European Commission President Ursula Von der Leyen and European Council President Charles Michel all attended the service, as did French President Emmanuel Macron.

US President Joe Biden did not travel to London. Instead US first lady Jill Biden led the American delegation, sitting next to Ukrainian first lady Olena Zelenska.

Yui Mok/Pool/Reuters
The Prince of Wales, Princess Charlotte, Prince Louis, the Princess of Wales and the Duke of Edinburgh at the coronation ceremony.

Plenty of celebrities also made an appearance, including singers Lionel Richie and Katy Perry, musician Nick Cave, actresses Emma Thompson, Maggie Smith, Joanna Lumley and Judi Dench, composer Andrew Lloyd Webber and broadcaster Stephen Fry.

Last to arrive, just before the King and Queen, were the most senior members of King Charles’ family, his siblings and children, including Prince Harry who traveled to the UK from the US without his wife, Meghan, the Duchess of Sussex and their two young children. Saturday is also Prince Archie’s 4th birthday.

Following the ceremony, Prince Harry did not appear on the Buckingham Palace balcony with his father and selected members of the family. CNN understands that the prince, who is no longer a working royal, did not receive an invitation to join the family for this moment.

The King’s younger brother Prince Andrew was also missing from the traditional balcony appearance. Andrew stepped back from royal duties in 2019 over his ties to disgraced financier and convicted pedophile Jeffrey Epstein. In January 2022, Andrew was stripped of his military titles and royal patronages after a judge ruled a sexual abuse civil lawsuit filed against him by Virginia Giuffre could proceed. The prince repeatedly denied any wrongdoing and the case was later settled out of court for an undisclosed sum.

Controversies ahead of the big day

Despite the splendor of the occasion, it has not been without controversy. Some have objected to millions of pounds of taxpayers’ money being spent on a lavish ceremony at a time when millions of Britons are suffering a severe cost-of-living crisis.

Security is by far the most costly element of large events and the Met said ahead of time that Saturday would be the largest one-day policing operation in decades, with more than 11,500 officers on duty in London.

The coronation has also attracted anti-monarchy demonstrations, with a small number of protesters arrested in central London on Saturday morning before the event began.

Republic, a campaign group that calls for the abolition of the monarchy, said the idea of the “homage of the people” was “offensive, tone deaf and a gesture that holds the people in contempt.”

Some eyebrows were also raised earlier this week when a controversial and widely criticized UK public order bill came into force.

Since the death of Queen Elizabeth II last year, there have been a number of instances of anti-monarchists turning up at royal engagements to voice their grievances against the institution.

The new rules, signed into law by the King on Tuesday, just days before the coronation, empower the police to take stronger action against peaceful protesters.

Republic said it was expecting between 1,500 and 2,000 people to join an anti-monarchy protest at Trafalgar Square, just south of the royal procession route. On Saturday morning, Republic said on Twitter that organizers of the protest had been arrested shortly after the demonstration started – including the group’s leader, Graham Smith.

Piroschka Van De Wouw/Pool/AFP/Getty Images
Protesters hold up placards saying "Not My King" and "Abolish the Monarchy" in Trafalgar Square, close to Westminster Abbey in central London on May 6, 2023.

The Metropolitan Police tweeted: “Earlier today we arrested four people in the area of St Martin’s Lane. They were held on suspicion of conspiracy to cause public nuisance.”

A further three people were arrested “on suspicion of possessing articles to cause criminal damage,” the force added. And “a number of arrests” have been made of people suspected of breaching the peace.

Despite the pomp of Saturday’s events, the King is facing significant challenges. A CNN poll has found that Britons are more likely to say their views of the monarchy have worsened than improved over the past decade.

The results of the survey, conducted for CNN by the polling company Savanta in March, show Charles’ heir Prince William is viewed with greater affection than his father.

Despite their cooler attitude towards the King, most Britons say they plan to take part in at least one event related to the coronation this weekend, the poll found, with many communities planning street parties and lunches.

Artists Perry, Richie and Take That will headline the “Coronation Concert” at Windsor Castle on Sunday evening and people have also been encouraged to use Monday, the final day of the long weekend, to volunteer in their communities.

CNN’s Lauren Said-Moorhouse, Max Foster, Catherine Nicholls, Lindsay Isaac and David Wilkinson contributed to this report.