Mr Price was first elected to Westminster in 2001 as MP for Carmarthen East and Dinefwr, where he remained until 2010.
It was when he joined the Senedd as the member for the same constituency in 2016 that he had the opportunity to further raise his profile at the chamber in Cardiff Bay.
In 2018, along with Plaid Senedd member for Ynys Môn, Rhun ap Iorwerth, he challenged Leanne Wood for the party’s leadership.
Image: Welsh First Minister Mark Drakeford (left) and Adam Price after announcing their co-operation deal in 2021
His period in charge has been one of mixed electoral success. In the 2022 local elections Plaid Cymru gained overall control of four councils, three more than in 2017.
Despite winning an extra seat in the Senedd in 2021 bringing their total to 13, the party’s vote share in that election remained virtually stagnant.
Plaid held on to all four of their seats at Westminster in the 2019 election in the early days of Mr Price’s leadership but lost out on key target seat Ynys Môn to the Conservatives.
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The party’s cooperation agreement with the Labour government in Cardiff Bay since the 2021 election means Plaid Cymru have been able to realise some of its manifesto pledges.
But allegations first emerged at the end of 2022 of a “toxic culture” following a BBC Wales report.
A working group, Prosiect Pawb, chaired by former Plaid Senedd member Nerys Evans, was set up to produce a report on the party’s culture following the claims which included “harassment, bullying and misogyny”.
Adam Price had apologised and vowed to tackle the culture within the party.
He told Sky News at Plaid Cymru’s spring conference in March, before the report was published, that the responsibility for the culture was “a shared one” and that the party had a duty “to get this right”.
The damning report found there had been “a lack of collective leadership and governance across the party” which meant issues had “worsened over the last few years”.
It was undoubtedly a difficult challenge for a leader who was found to have presided over a worsening culture within the party.
It became a case of when, not if, Adam Price would have to go.
Some suggested the issues existed within Plaid Cymru before he became leader, including former Plaid Senedd member Bethan Sayed.
She told S4C current affairs programme Y Byd yn ei Le that he was aware of issues and should have acted sooner “rather than wait for problems to build up”.
With Mr Price announcing he will stand down, attention will turn to his successor.
Sir Keir Starmer has joined other European leaders in Kyiv to press Russia to agree an unconditional 30-day ceasefire.
The prime minister is attending the summit alongside French President Emmanuel Macron, recently-elected German Chancellor Friedrich Merz and Polish Prime Minister Donald Tusk.
It is the first time the leaders of the four countries have travelled to Ukraine at the same time – arriving in the capital by train – with their meeting hosted by President Volodymyr Zelenskyy.
Image: Sir Keir Starmer, Emmanuel Macron and Friedrich Merz travelling in the saloon car of a special train to Kyiv. Pic: Reuters
Image: Leaders arrive in Kyiv by train. Pic: PA
It comes after Donald Trump called for “ideally” a 30-day ceasefire between Kyiv and Moscow, and warned that if any pause in the fighting is not respected “the US and its partners will impose further sanctions”.
Security and defence analyst Michael Clarke told Sky News presenter Samantha Washington the European leaders are “rowing in behind” the US president, who referred to his “European allies” for the first time in this context in a post on his Truth Social platform.
“So this meeting is all about heaping pressure on the Russians to go along with the American proposal,” he said.
“It’s the closest the Europeans and the US have been for about three months on this issue.”
Image: Sir Keir Starmer, Volodymyr Zelenskyy and Emmanuel Macron among world leaders in Kyiv. Pic: AP
Image: Trump calls for ceasefire. Pic: Truth Social
Ukraine’s foreign minister Andrii Sybiha said Ukraine and its allies are ready for a “full, unconditional ceasefire” for at least 30 days starting on Monday.
Ahead of the meeting on Saturday, Sir Keir, Mr Macron, Mr Tusk and Mr Merz released a joint statement.
European leaders show solidarity – but await Trump’s backing
The hope is Russia’s unilateral ceasefire, such as it’s worth, can be extended for a month to give peace a chance.
But ahead of the meeting, Ukrainian sources told Sky News they are still waiting for President Donald Trump to put his full weight behind the idea.
The US leader has said a 30-day ceasefire would be ideal, but has shown no willingness yet for putting pressure on Russian president Vladimir Putin to agree.
The Russians say a ceasefire can only come after a peace deal can be reached.
European allies are still putting their hopes in a negotiated end to the war despite Moscow’s intransigence and President Trump’s apparent one-sided approach favouring Russia.
Ukrainians would prefer to be given enough economic and military support to secure victory.
But in over three years, despite its massive economic superiority to Russia and its access to more advanced military technology, Europe has not found the political will to give Kyiv the means to win.
Until they do, Vladimir Putin may decide it is still worth pursuing this war despite its massive cost in men and materiel on both sides.
“We reiterate our backing for President Trump’s calls for a peace deal and call on Russia to stop obstructing efforts to secure an enduring peace,” they said.
“Alongside the US, we call on Russia to agree a full and unconditional 30-day ceasefire to create the space for talks on a just and lasting peace.”
Image: Sir Keir and Volodymyr Zelenskyy during a meeting in March. Pic: AP
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Putin’s Victory Day parade explained
The leaders said they were “ready to support peace talks as soon as possible”.
But they warned that they would continue to “ratchet up pressure on Russia’s war machine” until Moscow agrees to a lasting ceasefire.
“We are clear the bloodshed must end, Russia must stop its illegal invasion, and Ukraine must be able to prosper as a safe, secure and sovereign nation within its internationally recognised borders for generations to come,” their statement added.
“We will continue to increase our support for Ukraine.”
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The European leaders are set to visit the Maidan, a central square in Ukraine’s capital where flags represent those who died in the war.
They are also expected to host a virtual meeting for other leaders in the “coalition of the willing” to update them on progress towards a peacekeeping force.
Military officers from around 30 countries have been involved in drawing up plans for a coalition, which would provide a peacekeeping force in the event of a ceasefire being agreed between Russia and Ukraine.
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A special constable has been jailed after taking pictures on his phone from bodycam footage showing a dying man.
Former police volunteer William Heggs, 23, was sentenced to 12 months’ imprisonment at Leicester Crown Court on Friday after showing the photos of victim William Harty, 28, to a female colleague and storing them on his Snapchat account.
Mr Harty was found seriously injured in a residential street in Leicester on 25 October 2021 and Heggs had attended the scene, helping with CPR before paramedics arrived.
Mr Harty died in hospital a day later and the man responsible for his injuries, his brother-in-law Martin Casey, was subsequently convicted of his manslaughter.
Heggs showed the pictures he had taken of bodycam footage of Mr Harty’s body to a Leicestershire Police constable, who reported Heggs and said she did not like seeing blood.
His phone was seized and officers discovered other photographs and video clips of bodyworn footage of incidents Heggs had attended on duty, including of a knife seizure, use of baton and pepper spray, and a man with an injured hand receiving first aid.
He also took pictures of a police computer screen, showing details of crimes and suspects, without consent.
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Heggs stored the materials in a Snapchat folder and disclosed graphic details – most of which were not in the public domain – about the injuries to a woman who was killed in a road traffic collision he had attended, to a friend on the social media platform.
Heggs was suspended from the force in November 2021 and resigned in October 2024 before pleading guilty to 11 computer misuse and data protection offences this March.
Image: William Harty’s widow Mandy Casey. Pic: PA
‘He has traumatised me’
Mr Harty’s widow, Mandy Casey, said in a victim impact statement read to the court that Heggs “took (her) husband’s dignity when he was most vulnerable”.
“You don’t take someone’s dignity and pride from them on their deathbed.”
She continued: “When I found out special constable Heggs had done this, I just wanted to ask why. He has traumatised me. I feel I will never know if he showed them to others.”
Ms Casey said she was still scared that photos of her husband’s body might appear on social media.
She added that she had lost trust in the police.
Public trust in police ‘significantly undermined’
Judge Timothy Spencer told Heggs, who has autism and ADHD, that he was “probably too immature to be working as a police officer” as he handed down the sentence.
He said Heggs had received “extensive training”, including on the importance of data protection, and knew he should only share materials for “a genuine policing purpose”.
Heggs’s actions had “significantly undermined” public trust and confidence in police, according to the judge.
Malcolm McHaffie, from the Crown Prosecution Service, added: “William Heggs abused the public’s trust in the office he held as a special police constable.
“He violated the dignity of the deceased victims for no apparent reason other than what could be considered personal fascination and to gain credibility among his peers.”