The King has celebrated the first anniversary of his coronation with a social media video.

The 75-year-old monarch, who is being treated for an undisclosed form of cancer, was crowned alongside his wife Queen Camilla, 76, at Westminster Abbey in London on May 6, 2023, following the death of his mother Queen Elizabeth aged 96 the previous year.

A post from the royal family on its Instagram on Tuesday (AEST) shows a montage of the event, the footage opening with film of the King greeting well-wishers on The Mall outside Buckingham Palace on the eve of the coronation.

“Today marks the first anniversary of the King and Queen’s coronation in Westminster Abbey,” the caption read.

“As well as the service itself, the coronation weekend saw a carriage procession through central London, a fly-past, a royal salute by 4000 troops in the gardens of Buckingham Palace, a coronation concert at Windsor Castle and a UK-wide volunteering initiative.”

In an appeal for royal fans to share their memories of the big day, the post was signed off with the question: “What’s your favourite memory of the weekend?”

Audio at the start of the clip was from a pre-recorded message the King released at the time for train and Tube stations across Britain.

“My wife and I wish you and your families a wonderful coronation weekend,” he is heard saying.

The video also showed the King and Queen travelling to the ceremony from Buckingham Palace in the Diamond Jubilee State Coach.

It featured footage from inside Westminster Abbey, including the King’s crowning by the Archbishop of Canterbury with the St Edward’s Crown.

The monarch has returned to royal duties after his cancer diagnosis was revealed in February, with insiders telling The Sun he has told aides to “supercharge” his diary.

He resumed the duties with a visit to a cancer centre in London on April 30. His daughter-in-law, Catherine, Princess of Wales, 42, is still out of the public eye as she receives preventative treatment for the disease.