However, some of the most commonly mentioned and celebrated horses in racing history include:
Classic Horses:
* Sea Bird: A legendary French thoroughbred known for his stunning performances in the 1960s, including victories in the Epsom Derby, Irish Derby, and Prix de l'Arc de Triomphe.
* Citation: An American thoroughbred who held the record for the highest earnings for a racehorse for many years and won the Triple Crown in 1948.
* Man o' War: An American thoroughbred who dominated the racing scene in the early 1920s, known for his speed and winning record.
* Kelso: An American thoroughbred who won the Horse of the Year award an unprecedented five times.
* Secretariat: An American thoroughbred who holds the record for the fastest time in the Belmont Stakes and won the Triple Crown in 1973.
* Affirmed: An American thoroughbred who won the Triple Crown in 1978.
* American Pharoah: An American thoroughbred who won the Triple Crown in 2015.
* Justify: An American thoroughbred who won the Triple Crown in 2018.
Other Notable Horses:
* Black Caviar: An Australian sprinter considered one of the best racehorses of all time, with a record of 25 wins in 25 starts.
* Winx: An Australian thoroughbred who won four consecutive Cox Plate races and had an impressive winning streak.
* Frankel: A British thoroughbred who dominated the European racing scene and was known for his speed and dominance.
* Arkle: An Irish steeplechase horse known for his amazing jumping ability and victories in the Cheltenham Gold Cup.
Ultimately, the "greatest" horse is a matter of personal preference and depends on the criteria used to judge them. Some factors to consider include:
* Winning Record: Number of wins, championships, and major race victories.
* Performance: Speed, stamina, and overall dominance.
* Impact on the Sport: Legacy, influence on breeding, and fan appeal.
No matter who you consider the greatest, these horses have left an unforgettable mark on the world of horse racing.