This three-year-old horse was the first to win the US Triple Crown.
Citation
Secretariat
Gallant Fox
Sir Barton
Sir Barton in 1919. Only 11 horses have won the Triple Crown with the last being Affirmed in 1978. The Triple Crown is made up of the Kentucky Derby, Preakness Stakes, and Belmont Stakes. Sir Barton was the grandson of 1893 English Triple Crown winner, Isinglass.