Fair Play was the Sire of MAN 'O' WAR. Fair Play (April 1, 1905 - December 17, 1929) was an American-bred Thoroughbred racehorse who was successful on the track, but even more so as a sire.
Bold Ruler was the Sire of Secretariat.Bold Ruler (April 6, 1954 – July 11, 1971) was an American Thoroughbred Hall of Fame racehorse who won the 1957Preakness Stakes. He was the sire of two other Hall of Famers, Secretariat and Gamely.