Princess Anne on her horse Goodwill at the Badminton Horse Trials in 1973

At the age of 21, Anne won the individual title at the European Eventing Championship, and was voted the BBC Sports Personality of the Year in 1971. For more than five years, she also competed with the British eventing team, winning a silver medal in both individual and team disciplines in the 1975 European Eventing Championship, riding the home-bred Doublet. The following year, Anne participated in the 1976 Olympic Games in Montreal as a member of the British team, riding the Queen's horse, Goodwill, in Eventing.

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Anne assumed the Presidency of the Fédération Équestre Internationale from 1986 until 1994.

Source: wikipedia.com