The King has honoured the nation's war dead for the first time as monarch and laid a wreath at the Cenotaph in remembrance of all those who have made the ultimate sacrifice.
Thousands of veterans proudly wearing their medals, military families and the public packed Whitehall for the Remembrance Sunday ceremony and watched as Charles placed his floral tribute at the base of the memorial on Whitehall.
In recent years, Charles had performed the role on behalf of the Queen as the Prince of Wales, but as the first chimes of Big Ben rang out at 11am on Sunday and a two-minute silence began, he stood before the Cenotaph in his role as head of state.
Watch: Personnel tell us what Remembrance means to them.
A volley from a gun fired by the King's Troop Royal Horse Artillery from nearby Horse Guards Parade rang out to signal the start of the moment of silent reflection, punctuated by the sound of London traffic, and another loud blast marked its end.
Charles laid his wreath, its design a tribute to ones used by his late mother and grandfather George VI and it featured his racing colours, after buglers from the Royal Marines played the Last Post.
The wreath was soon joined by others left by the Prince of Wales, the Earl of Wessex, and the Princess Royal, with the Queen Consort's assistant equerry, Captain Edward Andersen, laying her tribute.
Watch: Head of the UK's Armed Forces delivers Remembrance message.
Prime Minister Rishi Sunak also paid tribute to the fallen on behalf of the Government by leaving a wreath, followed by Labour leader Sir Keir Starmer, other party leaders, senior members of the Cabinet, military chiefs of staff and high commissioners.
Watching from the balcony of a Government building were Camilla and the Princess of Wales, and nearby on another balcony were the Countess of Wessex and the Duke and Duchess of Gloucester.
The Remembrance Sunday ceremony has added poignancy this year as it is the 40th anniversary of the Falklands War, with former veterans marching past the Cenotaph.
You can watch the Falklands Remembrance service live on our Forces News YouTube channel at 13:35 UK time.