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With the royal succession complete, some Britons renew their calls for the abolition of the monarchy

"We wanted to make it clear that there’s more than one viewpoint about the monarchy in this country."

LONDON — It may have felt like the United Kingdom was brought to a supportive standstill after the death of Queen Elizabeth II, but not everyone in these isles agrees that a hereditary monarch should remain the unelected head of state in a modern democracy.

Polls suggest that a significant minority — millions of Britons — want to abolish the monarchy. Many of these people kept quiet last week, out of respect for the queen, but a few braved the crowds to bring a defiant message for their newly ascended sovereign: "Not my king."

These republican rumblings are not new. But many campaigners believe King Charles III presents a unique opportunity: They think most royalism was actually fondness for the widely loved queen, and he — a new, less popular king — won't inherit this support.

The debate has made for some febrile scenes.

As thousands crammed into the historic streets of Edinburgh to see Charles being proclaimed monarch in Scotland on Sept. 11, a small group of naysayers booed, held anti-royal placards and turned their backs while declaring “no consent.”

Image:
Tens of thousands of people packed into London, seen here at Hyde Park, for the queen's funeral Monday.Andreea Alexandru / AP

One woman, who held a sign saying “F--- imperialism” was arrested for a breach of the peace. And all were met in turn with boos, followed by chants of “God save the king!”

“We wanted to make it clear that there’s more than one viewpoint about the monarchy in this country,” said John Hall, 33, one of a half dozen protesters. “I wanted to be here and mark the fact that I did not consent to this pageantry.”

The anti-royalist crew outside Edinburgh's St. Giles' Cathedral was among a smattering of protesters who dotted the United Kingdom, popping up in London, Wales and elsewhere. They often drew an angry reaction from the mourners and spectators who had come out to see the queen make her final journey from Balmoral Castle, in the Scottish Highlands, where she died, to Windsor Castle, west of London, where she was buried Monday.

Many of the activists interviewed by NBC News across the country said they didn't want to disrupt the mourning period, and that they would not be protesting at events commemorating the queen specifically. But they felt they had no choice but to make their voices heard because Charles' ceremonial appointment — a highly political event, they argue— was happening at the same time.

The crux of their argument is that the lottery of birth has no place deciding the head of state of one of Europe's largest economies. They also say the monarchy costs the British taxpayer hundreds of millions of pounds a year. (This is disputed by monarchists, who say the royal “brand” brings in a net gain from tourism and culture.)

Then there are those who disagree with the message it sends.

While anyone, in theory, can be president of the United States, only a select few people can be Britain's head of state. For critics, this is part of a rigid class system that tacitly tells Britons: No matter how hard you work, it still matters who your parents are.

These views are not as fringe as suggested by the mass crowds and the wall-to-wall coverage of the queen's passing.

The monarchy is widely but not universally popular. Around 62% of people in Briton support it, but 22% — translating to more than 10 million British adults — want to see it replaced with an elected leader, according to a poll by YouGov in June.

Abolitionism has gradually grown since the 1990s, according to the National Centre for Social Research, a London-based institute that has conducted surveys on the monarchy over the past 30 years.

Royal popularity has been rocked by events such as Charles' divorce from Princess Diana, and his family's perceived coldness after her death in a car crash, the institute said, as well as allegations of sexual assault against Prince Andrew, which he denies, and the decision by Prince Harry and Meghan, Duchess of Sussex, to move to California amid their allegations of racism against the royal household.

An anti-royalist protester
A man confronts an anti-royalist protester outside St. James's Palace. Amara Eno for NBC News

“The monarchy is not as relevant today,” said Tracy Borman, a royal historian and the author of “Crown & Sceptre: A new history of the British monarchy, from William the Conqueror to Elizabeth II.”

“But it might have less to do with the monarchy itself and more with a younger generation who have grown up in a very different world, a world where the monarchy is not going to be on par,” she added.

The royals definitely are less popular among youths, according to the National Centre for Social Research. However the gap between the young and the old has remained almost the same as it was in 1994, it said, suggesting that, as the previously republican youngsters have grown up, they've become more monarchist.

Charles will present a new challenge for royal legitimacy.

As the Prince of Wales, he had been peppered with allegations of trying to interfere in politics, on issues from architecture to homeopathy. This is a big taboo for Britain's constitutional monarchy and strikes at the heart of why many republicans are relishing his reign.

Though the British crown has lashings of soft power — a figurehead every president, sheikh and dictator wants their photograph taken with — by design, it has little direct political power.

This power began to transfer from the monarch to the Parliament in the 1600s. The English Civil War resulted in the beheading of King Charles I, before the "Glorious Revolution" saw English elites effectively choose a new monarch who gave lawmakers more rights.

Today, the U.K. has what's known as a constitutional monarchy. In theory, the monarch appoints governments, reopens Parliament after recess and approves new laws. But those are all rubber-stamping ceremonial tasks; so far, there has been no question that the crown might try to intervene.

Image: The Prince And Princess Of Wales Visit Sandringham
William, the Prince of Wales, and Catherine, the Princess of Wales, look at floral tributes to the queen at Sandringham Estate on Thursday.Toby Melville / WPA Pool via Getty Images

Charles' record of activism has led many to question whether it will present a new constitutional headache for the apolitical crown.

“We’re supposed to be democrats and this is an anti-democratic institution,” said Graham Smith, chief executive of the London-based anti-monarchy group Republic. “It’s an institution that fails on all principles — they misuse public money, use their privilege to lobby the government and they interfere with politics.”

Charles has said he will take a different approach now that he is king.

As he was proclaimed king in London, he told an audience inside the ancient Westminster Hall that “I cannot help but feel the weight of history which surrounds us, and which reminds us of the vital parliamentary traditions" that define the nation.

Some observers agree that Charles should be viewed in an entirely new light now that he is king. “We’ve all got to look at him in a totally different way now,” royal historian Andrew Roberts said.

If he does clip his own politicking wings, it will be another example of the royal family's adapt-to-survive ability that has allowed it to exist for more than a millennium, the historian Borman said.

“The monarchy knows statesmanship is about knowing to give up what you can no longer keep,” she said.