High Quality Content by WIKIPEDIA articles! Cicero (1902–1923) was a British Thoroughbred racehorse and sire. He was the best English two-year-old of 1904, winning all five of his races. In 1905 Cicero became one of the shortest priced successful favourites in the history of the Derby, winning at 4/11 to remain undefeated. He won only once from his remaining three races before retiring to a modestly successful career at stud.