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Nearco was an Italian-bred Thoroughbred racehorse described by Thoroughbred Heritage as "one of the greatest racehorses of the Twentieth Century" and "one of the most important sires of the century." He was unbeaten, winning 14 races at distances from 1000m to 3000m, including the Derby Italiano and Grand Prix de Paris. He was then sold for a record amount to Martin H. Benson and stood stud in England, where he became the patriarch of several of the most dominant sire lines in Thoroughbred history.
Mr. Prospector was a Thoroughbred racehorse who became an outstanding breeding stallion and notable sire of sires. A sprinter whose career was cut short by repeated injuries, he won seven of his 14 starts, including the Gravesend Handicap at Aqueduct Racetrack and the Whirlaway Handicap at Garden State Park.
Claiborne Farm is a thoroughbred horse breeding operation near Paris, Kentucky. It was established in 1910 by Arthur B. Hancock, owner of Ellerslie Stud in Albemarle County, Virginia, and has been operated by members of his family ever since.
Buckpasser was a champion American Thoroughbred racehorse who was the 1966 Horse of the Year. His other achievements include 1965 Champion Two-Year-Old, 1966 Champion Three-Year-Old, 1966 Champion Handicap Horse, and 1967 Champion Handicap Horse. He was also the leading broodmare sire in 1983, 1984, and 1989.
La Troienne (1926–1954) was one of the most famous and influential Thoroughbred broodmares in twentieth century America. She produced 10 winners including two Hall of Fame inductees while at stud, while her daughters in turn produced many notable offspring. In 2000, pedigree expert Janeen Oliver designated her as the taproot of family 1-x, a designation that was implemented by the Pedigree Online Thoroughbred Database in 2003. Recent matrilineal descendants include 2003 Horse of the Year Mineshaft, Japanese Triple Crown winner Contrail (2020), Kentucky Derby winners Smarty Jones (2004) and Super Saver (2010), Belmont Stakes winner Essential Quality (2021), and Sussex Stakes winner Alcohol Free (2021).
Princequillo (1940–1964) was a Thoroughbred racehorse conceived in France and born in Ireland. He is known for his performances in long-distance races and his successes as a sire.
The title of champion, or leading, sire of racehorses in Great Britain and Ireland is awarded to the stallion whose offspring have won the most prize money in Britain and Ireland during the flat racing season. The current (2022) champion is Dubawi, who earned his first title after finishing runner-up multiple times.
The list below shows the leading Thoroughbred sire of racehorses in France for each year since 1887. This is determined by the amount of prize money won by the sire's progeny during the season. Due to the huge prize money of the Prix de l'Arc de Triomphe, the sire of the winner of that race typically wins the title of the Leading Sire in France.
The list below shows the leading sire of Thoroughbred racehorses in North America for each year since 1830. This is determined by the amount of prize money won by the sire's progeny during the year. It is restricted to stallions which are based in North America, but currently includes earnings from overseas races in Great Britain, Ireland, France, Italy, Germany and the United Arab Emirates as well as domestic earnings.
The list below shows the leading sire of broodmares in Great Britain and Ireland for each year since 1899. This is determined by the amount of prize money won during the year in Great Britain and Ireland by racehorses that were foaled by a daughter of the sire in question.
Somethingroyal was an American Thoroughbred racehorse best known as the dam of the 1973 U.S. Triple Crown champion and Hall of Fame inductee Secretariat. She also produced three other stakes winners and was named the 1973 Kentucky Broodmare of the Year.
Teddy (1913–1936) was a French racehorse and an influential sire, especially for lines in Italy, France, and the United States. He is considered one of the most influential sires in the 20th century.
Bull Dog (1927–1954) was a French Thoroughbred racehorse who became a North American Champion sire and Champion broodmare sire.
Sightseek is a retired American Thoroughbred racehorse and current broodmare. She was bred and raced by Khalid Abdullah's Juddmonte Farms and was trained by Hall of Fame inductee Robert Frankel.
Plucky Liege (1912–1937) was a British Thoroughbred racemare who produced eleven winners, including an Epsom Derby winner at the age of twenty-three and three British Classic race winners. The performances of these horses led to her becoming one of the most important broodmares of the 20th century.
Arthur B. "Bull" Hancock Jr. was a breeder and owner of thoroughbred racehorses at Claiborne Farm in Paris, Kentucky, United States. He acquired European horses to breed in the United States, in particular Nasrullah and Princequillo, and gained great standing in the racing world as a result.
Average earnings index (AEI) is a popular statistic used in North American Thoroughbred horse breeding. It is used to put the earnings of a breeding animal's progeny into proper perspective.
Marguerite was an American Thoroughbred racemare owned by Belair Stud who had to be retired after only one start but who established her place in racing history as the dam of four significant runners.
South Ocean (1967–1989) was a Canadian Thoroughbred Hall of Fame mare raced by Charles Taylor. She was bred by Charles's father E. P. Taylor, Canada's preeminent name in Thoroughbred racing and in world breeding history.
Admiral Drake was a French-bred thoroughbred racehorse who won the Grand Prix de Paris and was a Professional Chef-de-race.