"Deep sorrow". The heartfelt words chosen by Her Majesty as she announced to the world that her husband and life partner had died.
It is hard to imagine the Queen without Prince Philip by her side.
Watching the hundreds of hours of archive video, looking at the thousands of photographs, brings back so many memories, reinforcing what an extraordinary life they had together.
From their marriage described by Winston Churchill as a "flash of colour" in post-war Britain, to Prince Philip kneeling before the Queen at her coronation, pledging to be her liege man of life and limb, to the Queen describing the Duke as her strength and stay.
Despite constant public scrutiny, their marriage endured.
The only royal couple to ever mark over 70 years of marriage, they were one of the world's most famous and successful working partnerships.
They both had their roles.
Prince Philip once told his friend and private secretary Mike Parker that "his constant job is looking after the Queen. He told me his job first, second and last was never to let her down".
The Queen was always keen to give her husband jobs and responsibilities that would satisfy his restless spirit and inquiring mind.
When he stepped back from public duties, they did spend more time apart - but COVID brought them back together as they both stayed in Windsor Castle.
It may make that sense of loss even greater for the Queen, but on the other hand they were a very much a couple of that wartime generation.
For both of them, duty came first. And like many of their age, very matter of fact about death in their advancing years.
But that genuine affection for one another often shone through and saying goodbye will bring great sadness as we wait to see what that means for the Queen, who is due to turn 95 later this month.
As well as a working team, mostly importantly they were parents, grandparents and more recently great-grandparents together.
Yes the Queen wore the crown, but when it came to the family Prince Philip wore the trousers.
Often a sounding board for his children and grandchildren behind the scenes, it won't just be the Queen who will miss his words of support and counsel.
It was Prince Philip who encouraged Prince William to walk behind his mother's coffin.
It was Prince Philip who supported Prince Edward when he decided to leave the Royal Marines.
Never terribly sentimental but often sympathetic and there to give advice.
Throughout his life, the Royal Family have weathered some difficult times.
The past couple of years have again been turbulent, a time when the monarchy could do with the steadying influence of the Duke of Edinburgh.
But just like when he retired from public duties in 2017, there is again a sense that at the age of 99 he gave his all for the institution.
He lived a full and remarkable life, an unforgettable character who will be greatly missed, but whose lifelong commitment to public service and duty will forever be engrained within the Royal Family.