Queen Elizabeth and Prince Philip celebrate their 73rd wedding anniversary on Friday, an occasion they will be unable to share with their family as England is currently under a coronavirus lockdown.

Elizabeth, 94, and Philip, 99, married in London’s Westminster Abbey on Nov. 20, 1947, just two years after the end of the Second World War.

To mark their anniversary, Buckingham Palace released a photograph of a smiling monarch and her husband looking at a card made by her great-grandchildren Prince George, Princess Charlotte and Prince Louis, alongside other cards and letters from well-wishers.

The picture was taken at Windsor Castle, the queen’s home west of London where the couple are staying during the lockdown.

In a nod to their early days of marriage, Elizabeth was wearing a chrysanthemum brooch, made of sapphires and diamonds, that she wore for pictures taken at Broadlands in southern England during the first part of their honeymoon.

The couple first met when they attended the wedding of Philip’s cousin, Princess Marina of Greece, to Elizabeth’s uncle, the Duke of Kent, in 1934.

Philip gained the attention of his future wife when the then-13-year-old princess made a visit with her parents to Britain’s Royal Naval College at Dartmouth in southwest England where he was a cadet.

While royal watchers say Elizabeth and Philip have had their ups and downs like any married couple, they have avoided the travails of three of their four children whose marriages have ended in divorce, most notably eldest son Prince Charles’s ill-fated union with his first wife, the late Princess Diana.

“He has, quite simply, been my strength and stay all these years,” Elizabeth said of Philip when the couple celebrated their 50th wedding anniversary in 1997.