|Trainer||J. Elliott Burch|
|Quadrangle is a thoroughbred racehorse out of Tap Day by Cohoes. He was born around 1961 in the United States, and was bred by Paul Mellon.|
American Classic Race wins:|
Belmont Stakes (1964)
|Horse (Equus ferus caballus)|
|Last updated on March 4, 2010|
Quadrangle (1961–1978) was an American Thoroughbred racehorse who won the 1964 Belmont Stakes. Bred in Virginia by Paul Mellon, he was out of the mare Tap Day, a daughter of the Calumet Farm Champion stallion, Bull Lea. His sire was the multiple American stakes winner, Cohoes, a son of Mahmoud, the Aga Khan's 1936 Epsom Derby winner.
Conditioned for racing by future Hall of Fame trainer, Elliott Burch, Quadrangle is best known for spoiling Northern Dancer's bid to capture the 1964 U.S. Triple Crown when he won the Belmont Stakes at Belmont Park in Elmont, New York.
In 1964, Quadrangle also faced several other top quality three-year-olds including Hill Rise and Roman Brother, plus older horses such as the legendary Kelso and Gun Bow. Earlier in the 1964 racing season, the colt had won the Wood Memorial Stakes before finishing fifth in the Kentucky Derby and fourth in the Preakness Stakes to winner Northern Dancer. After his upset win in the Belmont Stakes under jockey Manuel Ycaza, Quadrangle and Ycaza went on to win that year's Dwyer Handicap, the prestigious Travers Stakes, and the Lawrence Realization Stakes. He returned to racing at age four in 1965 with his best result in a Graded stakes race, a second in the Californian Stakes at Hollywood Park Racetrack.
Retired to stud, Quadrangle was a successful sire of a number of stakes winners plus a Hall of Fame filly, and Eclipse Award winners including:
- Susan's Girl (b. 1969), U.S. Racing Hall of Fame inductee
- Square Angel (b. 1970), Canadian Champion Three-Year-Old Filly
- Smart Angle (b. 1977), 1979 American Champion Two-Year-Old Filly
While still at stud, Quadrangle died in 1978 at age seventeen.