She was celebrated for her charity work and for her support of the International Campaign to Ban Landmines.
Diana was involved with dozens of charities including London's Great Ormond Street Hospital for children, of which she was president from 1989.
Twenty-year-old Diana became Princess of Wales when she married the Prince of Wales on 29 July 1981 at St Paul's Cathedral, which offered more seating than Westminster Abbey, a church that was generally used for royal nuptials.
The service was widely described as a "fairytale wedding" and was watched by a global television audience of 750 million people while 600,000 spectators lined the streets to catch a glimpse of the couple en route to the ceremony.
He found that although she had suffered severe bruising, the foetus was uninjured.