Blacklock was a British Thoroughbred racehorse who won seventeen of his twenty-three races. As a two-year-old in 1816 he was undefeated in three starts. In his first race as a three-year-old he finished second in the St. Leger, a neck behind Ebor. He then won four races in two weeks, including the Gascoigne Stakes and Dundas Stakes. In 1818 he recorded several wins including two of the Great Subscription Purses at York. He won a third Great Subscription Purse in 1819, along with the York Gold Cup. After retiring from racing, Blacklock became a successful stallion and was champion sire of Great Britain in 1829, the year his son Voltaire won the Doncaster Cup. He was owned by Thomas Kirby as a two-year-old, before being purchased by Richard Watt, who owned him for the remainder of his racing career. Blacklock was trained by Tommy Sykes.

Voltaire was a British Thoroughbred racehorse. He won five of his six races, including the Doncaster Gold Cup in 1828. After retiring from racing he became a successful stallion, siring St. Leger winner Charles the Twelfth and Voltigeur, who won both The Derby and the St. Leger. He was bred and owned by Robert Stephenson, before being sold to William Vane, Marquess of Cleveland, whom he raced for as a three-year-old.