Doublet was a successful performer in the sport of Eventing, in which he was the regular mount of Princess Anne.
Doublet was ridden by Princess Anne when winning the gold medal in the 1971 European Eventing Championship.
Doublet was a gelding presented to Princess Anne as a gift from her mother, Queen Elizabeth II.
[1] He was sired by the Argentinian Thoroughbred stallion Doubtless out of a non-Thoroughbred mare named Swaté.
[3][4] He won gold at the European three-day eventing championships, in Burghley with Princess Anne on 4 September 1971, and finished fifth at the Badminton Horse Trials in the same year.