Tags: Race Horse.
Sir Thomas (1785 – after 1790) was a British Thoroughbred racehorse. In a career that lasted from October 1787 to May 1790 he ran thirteen or fourteen times and won nine or ten races. In 1788 he became the first horse owned by a member of the British Royal Family to win the Epsom Derby having been bought as a two-year-old by the Prince of Wales who later became King George IV. Following his win in the Derby Sir Thomas raced in the Prince’s ownership with some success until 1790.