The Tokyo Olympic Games' equestrian kicked off this weekend. Great Britain's 25-year-old Lottie Fry made her Olympic debut, 29 years after her late mother Laura Fry rode at the Barcelona Games. She and horse Everdale pulled out a personal best in the Grand Prix, scoring a high 77 percent.

       The Royal Family will likely be closely watching the sport, with the individual dressage and team dressage events to take place today at 9am.

       Horses have a special place in the hearts of many royals, none more so than with the Queen and Princess Anne.

       In 1976, Anne became the first member of the British Royal Family to compete in the Olympics.

       Here, she entered the three-day equestrian event, riding her mother's much-loved horse, Goodwill.

       Her whole family was in attendance to cheer her on.

       Archive reports, however, reveal that the Princess Royal remembered little of the course itself.

       This was the result of a horrendous fall during the competition.

       Coming off her horse, she got back on and completed the course, but later admitted: "I was going very well and then I don’t remember anything else.

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       "Nothing at all."

       Anne's former lady-in-waiting, Jane Holderness-Roddam, a fellow event rider, recalled the series of events to ITV's documentary, 'Anne: The Princess Royal at 70'.

       Ms Holderness-Roddam wasn't able to go to the 1976 Olympics, so watched it on TV.

       She explained: "What I didn’t know at the time was she had this awful fall, but she got back on and competed.

       "She was that concussed that she couldn’t remember - and still to this day I believe can’t remember - the rest of the course."

       Anne's concussion is no uncommon thing in horse riding.

       Equestrians always wear helmets in the event of being thrown from their horse.

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       Yet, concussion - or traumatic brain injury - remains the third most common type of injury related to horse riding.

       Other serious injuries include spinal damage and bone fractures.

       Fellow Olympian Sebastian Coe, who worked with Anne on the London Olympics, said he is always impressed by competitors' sturdiness.

       He said: "It is probably the most dangerous sport on the planet.

       "I’ve watched a lot of three-day eventing and I know that the competitive granite that those men and women are made from."

       Anne's daughter, Zara, followed in her mother's footsteps and competed in the Olympics.

       She was part of the British equestrian team for London 2012, winning a silver medal in the team event.

       Anne presented her with the medal.

       Speaking to the documentary, Zara said she was not surprised her mother got back on her horse and carried on with the event.

       She said: “Her mantra for life is very much, ‘if you fall, get back up and try again’.”

       Peter Phillips, her son, added: "Get up, carry on and mind your manners."

       Not only was Anne a competitor, but Zara and Peter's father, Mark Phillips, was also a top equestrian.

       He won gold in the 1972 Olympics in Munich and silver at the 1988 Olympics in Seoul.