Queen Elizabeth II, the Queen of England and her husband Prince Philip, are celebrating their 73rd wedding anniversary.

The British royals marked the occasion by releasing a photograph of them reading a card made by their great-grandchildren, Prince George, Princess Charlotte and Prince Louis.

The couple are sitted on a sofa in the Oak Room at Windsor Castle, where they are spending lockdown.

The Queen chose to wear a chrysanthemum brooch, made from sapphires and diamonds set in platinum. She wore the same brooch in photographs taken on their honeymoon at Broadlands in Hampshire, and again in pictures taken to mark their diamond wedding in 2007.

On their golden wedding anniversary, Queen Elizabeth paid very personal tribute to Prince Philip in a speech at the Guildhall in London, in which she said: “He has been my strength and stay all these years.”

Prince Philip, now 99, retired from public engagements in 2017, and he lives largely on the Sandringham estate in Norfolk. Queen Elizabeth on the other hand resides at Windsor Castle and Buckingham Palace. But during the pandemic lockdown, the couple stayed together at Windsor Castle.

The colourful card made by their greatgrandchildren was one of several anniversary cards and letters sent by well-wishers to the couple.

The Queen, 94, was a 21-year-old when she married Lieutenant Philip Mountbatten on 20 November 1947. Their 73-year old marriage has lasted the longest of any British sovereign.