 Tristan ( 1878 – 1897 ) was a British Thoroughbred racehorse and sire . In a career that lasted from the April 1880 to October 1884 , he ran 51 times and won 27 races . A useful performer at two and three years old , he matured into an outstanding horse in his last three seasons , winning important races at distances ranging from six furlongs ( the July Cup ) to two and a half miles ( Ascot Gold Cup ) and defeating three winners of the Epsom Derby . Unusually for a 19th @-@ century racehorse , he was regularly campaigned internationally , winning three consecutive <unk> of the Grand Prix de Deauville . Tristan 's success was achieved despite a dangerous and unpredictable temperament : at the height of his success , he was described as " a very <unk> @-@ tempered animal " . 
