Furious protesters have gathered in Windsor to oppose Tony Blair receiving Britain's highest chivalric honour.
The former prime minister was knighted last week and today is being made a Knight Companion of the Most Noble Order of the Garter.
The ceremony will take place at Windsor Castle and demonstrators have formed a picket line outside the royal residence.
Activists are holding up placards emblazoned with "Bliar" and "Sir War Criminal".
The Queen will attend today's ceremony - but is unlikely to appear in public parts of the occasion.
Prince Andrew is also expected to be present, but will likewise stay out of the public elements of the ceremony.
The Queen has apparently told him to stay out of sight “for his own good” after Prince Charles and Prince William raised fears of a public backlash.
Sir Tony's knighthood has proven controversial, with a petition against it receiving more than 1.5million signatures.
The petition said he was the "least deserving person of any public honour" and that he should be "held accountable for war crimes".
Sir Tony, who was knighted by the Queen on Friday, was prime minister during the Allied military invasions of Iraq and Afghanistan.
The campaign group Stop the War previously wrote on Facebook : "Tony Blair should be heading to The Hague.
"Instead, on June 13, he will be heading to the castle at Windsor where he will be knighted by the Queen.
"Despite the disastrous legacy of Blair’s foreign policy the British establishment has learnt few lessons.
"Blair has blood on his hands and is personally responsible for the deaths of thousands of innocent civilians and service-people in Afghanistan and Iraq.
"He is the least deserving person of any public honour. Join the Stop the War protest at the annual Garter Day procession in Windsor and let the world know there is only one court that Blair should be attending and it’s not the royal one.
"We're assembling at 1pm at the Queen Victoria Statue on Castle Hill, Windsor, SL4 1PD to say 'Jail Blair! No knighthoods for war criminals'."
Stop the War organised a huge anti-war march in London on the eve of the Iraq invasion, with hundreds of thousands of protesters taking part.
Sir Tony accepted "full responsibility" for the decision to invade Iraq after the release of the Chilcot report in 2016.
The former prime minister said: "I feel deeply and sincerely in a way that no words can probably convey the grief and suffering of those who lost ones they loved in Iraq, whether members of our armed forces, the armed forces of other nations of Iraqis."
He added that the intelligence assessments made before heading into war "turned out to be wrong".
"I express more sorrow, regret and apology than you may ever know or can believe," he said.
Baroness Valerie Amos is also being appointed Lady Companion of the Order at Windsor Castle today.
Get all the latest news sent to your inbox. Sign up for the free Mirror newsletter
The Labour member of the House of Lords, who was the first black person to become a cabinet member, will be the first black person appointed Lady Companion of the Order.
Meanwhile, Camilla will also be made Royal Lady of the Most Noble Order of the Garter today.
The Queen personally selects Knights of the Garter as an honour in recognition of their work.
The royal.uk website explains: "Today, the Order includes the Queen, who is Sovereign of the Garter, several senior Members of the Royal Family, and twenty-four knights chosen in recognition of their work.
"Knights of the Garter are chosen personally by the Sovereign to honour those who have held public office, who have contributed in a particular way to national life or who have served the Sovereign personally.
"These have included Marshal of the RAF, Lord Stirrup, and former Prime Ministers Sir John Major and Sir Winston Churchill."
New Knights of the Garter are appointed during an annual Garter Day procession in June.
