Sancho (1801–September 1809) was a British Thoroughbred racehorse and sire best known for winning the classic St Leger Stakes in 1804. In a racing career which lasted from May 1804 until October 1806 he won eight of his twelve competitive races. Originally trained in Yorkshire, he was undefeated in four races as a three-year-old in 1805, culminating with his victory in the St Leger at Doncaster Racecourse. In the following season he was transferred to race in the south of England where he won a series of lucrative match races against some of the leading horses of the day. His five-year-old season proved disappointing and expensive for his owner as he was injured and beaten in both of his races. Sancho was retired from racing and showed considerable promise as a sire of winners in a brief s