High Quality Content by WIKIPEDIA articles! Coronach was a British Thoroughbred racehorse and sire. He was a champion two-year-old who went on to complete a then unique treble by winning the Epsom Derby, the Eclipse Stakes and the St Leger as a three-year-old in 1926, a year in which he also won the St. James`s Palace Stakes. He won the Coronation Cup at four, but was beaten in his two remaining starts by his long-standing rival Colorado