She was one of the icons of the 20th century, helping to define a generation of British royalty. Although she was aged just 19 when she became engaged to the Prince of Wales, and was a Princess for just 16 years, Diana transformed the ancient institution into which she married.
Her legacy continues in the official causes her sons, Princes William and Harry, have embraced in her name.
The royal brothers have grown into fine young men who have proved themselves time and again to be a credit to their mother
Her maternal instinct was to give them as normal childhood as possible with plenty of hugs and fun, despite the goldfish bowl existence of royal life
Their world was torn apart by her untimely death in 1997. But their father took up the mantle and they've been very close to him ever since
The tragedy has also meant that they are as close as two brothers can be. "Harry knows what I'm thinking. It means that he can stop me from doing anything stupid," says William
They have followed in her footsteps working with some of those most in need.
In 2010 they travelled to Africa to see projects they have backed, including St Leonard's Herd Boy School in Lesotho. Here they watched a play about Aids and HIV
Harry, in particular, exudes Diana's personal touch. He founded his charity Sentebale, meaning forget me not, to help the children of the African country in honour of his mother
The younger sibling also championed the Princess' anti-landmine campaign, evoking one of his mother's most memorable moments
The fun she instilled in them is never far from their minds either. On what would have been her 46th birthday, they celebrated her life in way she would've loved with music and laughter
A month later, they held a memorial service at The Guards’ Chapel, part of London’s Wellington Barracks, to mark the tenth anniversary of her death.
In a moving address, Harry said their mother was "our guardian, friend and protector", adding: "She never once allowed her unfaltering love for us to go unspoken or undemonstrated… she was quite simply the best mother in the world… we both think of her every day"
The public has never forgotten the Queen of Hearts either. Crowds are expected to make the pilgrimage to the Diana Memorial Fountain, opened by the Queen in July 2004 near Kensington Palace where the Princess lived.
Made from 545 pieces of Cornish granite, it was designed to reflect the Diana's life. Water cascades from the highest point, bubbling and swirling in two directions before calmly meeting in a pool below
As her brother Earl Spencer said, she will continue to fascinate. Poignantly this year he welcomed a little girl with his wife Karen, naming her Lady Charlotte Diana Spencer.
He said: “Though it’s been 15 years since Diana died, I still miss her every day, and I wanted her commemorated in the naming of our daughter"
His nephews though have made a concerted effort to turn the page in one important respect. They have accepted their father's second wife and enjoy an affectionate relationship with her
No one was more thrilled than Camilla when William announced his engagement to his university sweetheart Kate Middleton."It's the most brilliant news. I'm just so happy and so are they. It's wicked," she said.
His mother would've also have been very proud. To underline her connection to the happy day the future king presented his bride-to-be with the spectacular sapphire that sealed his own betrothal nearly 30 years before
Like the woman who would've been her mother-in-law, Kate radiates natural beauty and an easy charm. She's become an invaluable support for her husband, who's noticeably more relaxed and confident in her presence
In turn he's protective of his dazzling Duchess, having learnt as he said from past mistakes. Together they are a winning team on the global stage – surely Diana's most precious legacy