Daniel Day, 30, was handed a 14-month prison sentence, suspended for two years, by Southwark Crown Court on Monday.
He was accused of causing "serious disruption" by scaling the Elizabeth Tower at the Palace of Westminster on 8 March last year.
His actions triggered a major response from emergency services and caused road closures around Westminster.
Day cost the taxpayer at least £92,000 as he refused to come down and livestreamed his protest on Instagram while chanting "Free Palestine", the court heard.
He was found guilty in June of intentionally or recklessly causing a public nuisance. He also admitted trespassing on a protected site.
Day shared videos on Instagram during his 16-and-a-half-hour sit-in on the tower's ledge, suggesting in one clip that he planned to stay there for three-and-a-half days.
Judge Tony Baumgartner said: "This was well-planned offending and you knew precisely what you were doing.
"Foolishly you climbed a far way up the tower, far enough to cause very serious harm to you and possibly others if you fell."
The judge told Day he had "little insight into your offending or any real remorse", but noted that he had not offended since the Big Ben incident and had strong personal mitigation, including failing eyesight.
Day must attend up to 20 rehabilitation days and will be electronically monitored for four months as part of the suspended sentence.
"It's good to see people having strong principles, but it doesn't give a licence to break the law," the judge said.
The court heard Day, who is unemployed, climbed over railings and began his ascent of the tower at 7.20am, having carried out prior research on restoration of the building.
He wore thermals for the climb and brought a camera for livestreaming.
Prosecutor Jack Guise said Day unfurled a Palestinian flag after he reached a ledge midway up the tower and stayed there until about midnight.
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During the climb, the protester took his shoes off and his feet started to bleed on to the stonework.
Metropolitan Police officers had no option but to wait for him to agree to come down.
As news of the demonstration spread, pro-Palestine supporters started to gather in Parliament Square.
Mr Guise said police assessed that Day was "being encouraged by having a gallery to play to".
In footage played during the trial, Day said: "We're being violently attacked by police for peaceful protest.
"That's why I'm taking action at the so-called hub of democracy today."
He also shouted: "Listen, no police are to come anywhere near me. If you come too close, I'm going higher.
"I'm here peacefully, I'm here to harm nobody."
As part of the safety measures - and to take away Day's audience - officers shut Bridge Street and Westminster Bridge, cut off pedestrian access to Parliament Square, and set out cordons on Whitehall and Victoria Embankment.
Mattresses had to be placed at the base of the tower as a precaution, the court heard.
Transport for London (TfL) lost an estimated £25,000 in bus fares as diversions were put in place and Mr Guise said dozens of officers from across London had to be redeployed to the incident.
The cancellation of more than 2,500 tours of Parliament cost another £67,000.
Day of Westcliff-on-Sea, Essex, received a conditional discharge in June 2024 for failing to remove a facial disguise, and was ordered to pay £200 in fines in November 2024 for blocking a road during a protest.
He hugged supporters in the well of the court after being released from the dock with a suspended prison sentence.
The 83-year-old You're So Vain singer said in a statement that her most recent absence from the spotlight has been due to her ongoing health issues.
Ms Simon said: "So many people have written to me, kindly wondering about my relative silence, asking how I am and what I have been doing. The truth is, I've been learning how to live with Parkinson's disease.
"It has taken me some time to understand the diagnosis, to adjust to it, and to decide how much I wanted to say about it publicly."
She added: "Parkinson's is different for everyone, and it can be unpredictable. Some days I'm so tired I can't get the day moving at all. On others, it gives me a little more room to move, think, work, and feel like myself."
Ms Simon, who lives on a 25-acre Martha's Vineyard estate in Massachusetts, said her health problems started with arthritis in both knees and one hip.
She said she eventually had all three joints replaced with "delicate bouquets of metal and plastic".
The Grammy-award-winning musician said after three replacement surgeries, she assumed her struggle walking was "simply an unfortunate and rather ironic part of the recovery process".
She said, however, that her mobility continued to worsen.
Ms Simon said: "I had trouble standing up from low chairs and deep couches without someone offering me an arm. Overstuffed furniture became my enemy. Once seated, I could feel as though I had been swallowed by the chair and might remain there permanently, like a guest who had badly overstayed her welcome.
"Eventually, there were periods when I could not walk without considerable help. My family and I knew that something more was going on. After an extensive evaluation at the Mayo Clinic, I was diagnosed with Parkinson's."
Parkinson's disease is a neurodegenerative condition that causes parts of the brain to become progressively damaged over the years.
In the UK, the number of people diagnosed with the disease is around 166,000, according to the Parkinson's UK charity.
The figure is expected to reach 173,000 by 2030, as the population grows and ages.
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The star said she started treatment, including taking medication to help with stiffness and other symptoms.
Describing how it affects her day-to-day life, Ms Simons said that the "apathy is particularly strange".
She said: "You can find yourself lying there like a starfish drying in the sun, arms pointing in all directions, while nothing inside is telling you to get up, read, watch, write, sing, call someone, or do much of anything at all."
Ms Simon has two children, Sally and Ben Taylor, aged 52 and 49, from her relationship with her first husband, fellow singer-songwriter James Taylor, whom she was married to from 1972 until divorcing in 1983.
The artist said she had also received treatment for basal cell carcinoma, a common type of cancer that starts in the top layer of skin, on her face.
She said it was removed but the surgery affected her appearance and made her more self-conscious about being seen in public.
She said: "I have always been more critical of my appearance than anyone else could possibly imagine (check out the irony of having written You're So Vain), and this gave my inner critic quite a lot of new material."
Ms Simon, who is also a children's author, said that "between my mobility issues, the Parkinson's diagnosis, the surgery, and the emotional effects of it all, withdrawing from public view was the most palatable reaction".
Despite health issues relating to the condition, she said she has not stopped working and began recording a new album, Comes in Waves, in the middle of it all.
She continued: "I do not consider Parkinson's a gift or a blessing. It is neither. It is difficult, frustrating, and sometimes frightening. I am still learning how to live with it and how to accept it without feeling that I have surrendered something essential.
"I am still writing, singing, imagining, laughing, worrying, remembering, and occasionally getting trapped in an overstuffed chair.
"I am deeply grateful to my children, my family, my friends, my caregivers, and the medical professionals who have helped me through this. Their love and patience have carried me through days when my own reserves were not enough."
Ms Simon rose to fame in the 1960s and achieved international stardom in the 1970s with hit singles including Anticipation and Nobody Does It Better, the theme song to the 1977 film, The Spy Who Loved Me.
Her third album, No Secrets, contained the hit song You're So Vain, a song about a self-absorbed lover, prompting speculation over who she was singing about. Ms Simon once disclosed the song was about three different men, one of whom she named as Hollywood star Warren Beatty.
Comes In Waves, Ms Simon's first album in almost 15 years, is set to be released on 14 August.
The TV star, who found fame in the 1970s as a member of comic trio The Goodies, alongside Tim Brooke-Taylor and Graeme Garden, died on Saturday.
He went on to host wildlife programmes for the BBC, including Birding With Bill Oddie, Bill Oddie Goes Wild, Springwatch and Autumnwatch.
His agent and friend David Foster paid tribute to the "intelligence and wit" of "Britain's best-loved birder".
"It is with deep sadness that I announce the passing of Bill Oddie, the country's best-loved birder," he said.
"Bill was a multi-talented celebrity - wildlife presenter, broadcaster, comedian, writer, songwriter, musician and conservationist. Yet it was never fame that he valued.
"Instead he encouraged us to respect and protect the environment. He taught us the wonder of it. He protested, lobbied and campaigned for it.
"He led the way and people of all ages and backgrounds responded to his call. And such a massive contribution to conservation will never be forgotten.
"My thoughts and love are with Bill's wife, Laura, and his daughters Bonnie, Kate and Rosie, who have asked not to be contacted at this sad time. Please respect their wishes."
From comedian to nature presenter
While Oddie later became known for presenting nature shows, the natural world had always been a passion of his.
A birdwatcher since his childhood in Birmingham, he was a respected ornithologist.
He was a council member of the RSPB, the Wildfowl and Wetlands Trust and The Worldwide Fund for Nature. He was also president of The Northumberland Wildlife Trust and represented many other nature organisations.
His comic career began in the Cambridge Footlights, when he started writing for shows including That Was The Week That Was.
He went on to write and appear on numerous programmes including I'm Sorry I'll Read That Again, which featured many of his comic songs.
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His songs led The Goodies to several major chart hits, most notably with the 1975 track The Funky Gibbon.
He continued to work with his fellow Goodies on programmes including Bananaman, before turning his attention to nature shows.
Oddie spoke openly about suffering from crippling depression and was also diagnosed with bipolar disorder.
The presenter was admitted to a psychiatric hospital in 2009 after being dropped from the BBC's Springwatch show, of which he was one of the original hosts.
Sir Clive's tenure as Charles' right-hand man saw him play a leading role in the King's coronation and the response to various family scandals.
He said on Monday that he would resign as the King and Queen's principal private secretary next year - aligning with his 60th birthday in May - but will continue supporting the royal couple in a "less formal capacity".
Sir Clive said in a message to staff: "It has been the greatest imaginable honour to serve the King and Queen in my present role through such historic times and with unforgettable humour along the way.
"That support will continue, in a less formal capacity, for all of my life."
A Buckingham Palace spokesperson said: "I know Their Majesties are deeply grateful to [Sir] Clive for his tireless support and wise counsel over the years, and for the enduring loyalty that will ensure a smooth transition to his successor."
The palace will now seek to recruit his successor, and will consider external and internal candidates, before a handover period during the spring and summer of 2027.
Sir Clive has frequently been at the King's side during high profile engagements, and has been photographed receiving prime ministers at the palace for the start and end of their tenures.
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During his years in post, Sir Clive played a pivotal role in King Charles' smooth accession to the throne and his first years as monarch.
His time in the job has coincided with challenges like the decision of the Duke and Duchess of Sussex to step down as working royals, and the fall of Andrew Mountbatten-Windsor. He's speculated to have played a part in managing these moments.
It's understood Sir Clive, who has been described by his wife as "complete workaholic", plans to spend more time with his family after he steps down from the role.
Sir Clive has been principle private secretary to the King and Queen for 11 years, in the culmination of a career that also saw him serve as private secretary for foreign and commonwealth affairs, and ambassador to Morocco.
He also served as deputy private secretary to the then Prince of Wales and Duchess of Cornwall from 2006 to 2008.
On Monday, a federal court judge in Miami set 13 August as the date when the court will decide whether the controversial social media influencers should remain in custody or be released during the process to extradite them.
The brothers were not in court on Monday and have remained in jail since making a brief court appearance two days after their arrest on 18 July.
Lawyers for the pair said they wanted the US government to hand over documents that UK officials submitted to secure their arrest.
"They don't have anything but the accusations," lawyer Joseph McBride said after the hearing. "It's just their word against our word right now."
UK authorities have until mid-September to hand over all materials to the state department, US attorney Alejandra Lopez told the court.
British prosecutors announced earlier this month that they had brought 38 new charges against the pair, who have repeatedly denied wrongdoing.
Andrew, 39, was charged with seven further counts of rape and several trafficking and assault offences, while Tristan, 38, was charged with two counts of rape, sexual assault and trafficking offences.
Andrew was also charged with offences relating to "indecent images of a child and extreme pornography".
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The Crown Prosecution Service (CPS) said it had identified four additional alleged victims. It said the 38 additional charges, in addition to 21 existing charges, related to alleged offences between July 2010 and August 2017.
The brothers have previously denied allegations of sexual abuse and trafficking, claiming that violent and misogynistic statements had been taken out of context or were intended as jokes.
The extradition case is the latest chapter in the brothers' long-running international legal saga that has spanned the US, Britain and Romania.
The brothers, who are US and British citizens, built a social media empire promoting wealth, male dominance and misogyny, which made them among the world's most polarising internet personalities.
Arrested in Romania in 2022, they were accused of participating in schemes to lure women for sexual exploitation, allegations they denied.