High Quality Content by WIKIPEDIA articles! Cotherstone (1840–1864) was a British Thoroughbred racehorse and sire. In a career that lasted from September 1851 to July 1853 he ran eleven times and won eight races. After being beaten on his debut, Cotherstone won his next six races including the 1843 2000 Guineas and Epsom Derby. A narrow defeat in the St. Leger Stakes prevented him from being recognised as the first winner of the English Triple Crown. He was regarded by contemporary experts as one of the best British racehorses of his era. After sustaining a serious injury in his only race in 1844 he was retired to stud where he had moderate success.