In U.S. horse racing, an unofficial championship attributed to a Thoroughbred horse that in a single season wins the Kentucky Derby, the Preakness Stakes, and the Belmont Stakes. First won in 1919 by Sir Barton, it has since been won 10 times, most recently by Secretariat (1973), Seattle Slew (1977), and Affirmed (1978).
This entry comes from Encyclopædia Britannica Concise.
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