Diana Frances Spencer was born on July 1, 1961 in Norfolk, England.
The Spencer family had close ties with the British Royal Family long before Diana married into it, with both her grandmothers serving as ladies-in-waiting for the Queen mother.
Diana met Prince Charles when she was just 16 years old.
They got engaged when she was 20, and married a few months later.
Sadly, the marriage was not to last, and the couple eventually divorced, but not before having two little boys: William and Harry.
Tragically, in a life hounded by paparazzi and media interest, Diana died in a car accident in Paris on August 31, 1997. She was 36.
How old would Diana be today?
If Diana were alive, today would be her 57th birthday.
In an ITV interview last year, marking the 20th anniversary of her untimely death, her loving sons spoke of her with great fondness.
They recalled her wicked sense of humour, particularly over her outfit choices for her children.
Harry said: “I would love to ask her now because I genuinely think she got satisfaction out of dressing myself and William up in the most bizarre outfits.
“Normally matching – it was weird shorts – shiny shoes with a clip on. The photos just make me laugh and I think ‘how could you do that to us?’.”
Harry also remembers Diana as “one of the naughtiest parents”.
He said: ”She was fun through and through. One of her mottos to me was, ‘You can be as naughty as you want, just don’t get caught.’
“She would come and watch us play football and, you know, smuggle sweets into our socks.”
Prince William was 15 and his brother Harry just 12 when their mother was killed.
The death of the People’s Princess, as she became known, sent shock waves around the world.
Diana had become a relatable figure within the royal family which, at that time, was considered quite inaccessible by the British public.
She was known for her tenderness and vulnerability, and the genuine kindness she showed everyone she met.
One of her most powerful gestures came in 1987 when she took the hand of a man with HIV on camera.
The simple but powerful act helped dispel the myths surrounding the disease and shifted public perception of sufferers, a cause her sons continue to champion.
Diana told BBC’s Martin Bashir: “Nothing brings me more happiness than trying to help the most vulnerable people in society.
“It is a goal and an essential part of my life, a kind of destiny.”
No doubt, she would have been very proud of the lives her boys William and Harry have forged for themselves as adults.
She has three grandchildren so far, which she sadly never got to meet – William and Kate’s little ones.
She would have no doubt been a fantastically fun grandmother.