Triple Crown of Thoroughbred Racing (United States)
In the United States, the Triple Crown of Thoroughbred Racing, commonly known as the Triple Crown, is a series of horse races for three-year-old Thoroughbreds, consisting of the Kentucky Derby, Preakness Stakes, and Belmont Stakes. The three races were inaugurated in different years, the last being the Kentucky Derby in 1875.
Source: Wikipedia — Triple Crown of Thoroughbred Racing (United States) (CC BY-SA 4.0)