The Triple Crown of Thoroughbred Racing, often shortened to Triple Crown, comprises three races for three-year-old Thoroughbred horses.
The Thoroughbred is a horse breed best known for its use in horse racing.
The horse is one of two extant subspecies of Equus ferus.
The Triple Crown of Thoroughbred Racing by WatchMojo.com
Winning all three of these Thoroughbred horse races is considered the greatest accomplishment in Thoroughbred racing.
American Pharoah wins the Triple Crown 2015 Belmont Stakes by TVG Network
The term originated in mid-19th century England and different nations where thoroughbred racing is popular each have their own Triple Crown series.