The King led the nation in honouring the sacrifices of those who brought peace to Europe 80 years ago at a service marking the VE Day anniversary at Westminster Abbey.
Charles left a floral tribute at the Grave of the Unknown Warrior on behalf of the nation and Commonwealth, during a poignant moment.
A handwritten message from the King, recognising those who fought and died in the Second World War, read: "We will never forget."
A national two minutes silence was observed before the simple ceremony, and among the congregation were veterans of the conflict who helped to defeat fascism on the continent during a war that lasted almost six years.
The Abbey fell silent and the sound of London traffic could be heard as all stood motionless in quiet contemplation.
The Prince of Wales left a wreath a few moments after his father, in a tribute to Second World War veterans and the generation who lived through the conflict.
Both wreaths featured flowers which would have been in bloom in May 1945.
William and his wife left a handwritten note with their wreath which read: "For those who made the ultimate sacrifice during the Second World War. We will remember them."
Standing beside them was Ken Hay, 99, who served in the 4th Dorset infantry regiment.
Among the guests were the Queen, the Princess of Wales, the Princess Royal and her husband Vice Admiral Sir Tim Laurence, the Duke and Duchess of Edinburgh, the Duke of Kent and Prime Minister Sir Keir Starmer.
On May 8 1945 the nation celebrated Victory in Europe (VE) Day, as church bells rang out across the country and people gathered to revel in the end of hostilities, and crowds famously gathered outside Buckingham Palace and called for King George VI.
After almost six years of fighting against Hitler's Nazi regime, peace was declared, with only the conflict against Japan to be concluded.
The congregation heard wartime leader Sir Winston Churchill's radio broadcast announcing the end of hostilities, which concluded with the words "long live the cause of freedom".
Second World War artefacts including a child's gas mask, sailor's cap and an air raid warden's helmet, representing the armed forces and the Home Front, were processed through the abbey.
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And the familiar wartime song The White Cliffs Of Dover was sung by Zizi Strallen.
The King wore a lounge suit with medals and neck order for the service.
The Queen wore a white crepe silk dress and white coat with black stitching by Anna Valentine, with a black and white hat by Philip Treacy.
Her Majesty also wore a Cartier brooch.
The Prince of Wales wore a loung suit Suit with household decision tie and Great Master of the Most Honourable Order of the Bath Neck Order.
He is also wearing Gold jubilee, diamond jubilee, platinum jubilee and coronation medals.
The Princess of Wales wore a dress by Alessandra Rich, Hat by Juliette Botterill and earrings belonged to Diana, Princess of Wales.