Bold Ruler
Bold Ruler was the first horse to undergo radiation therapy when he was diagnosed with sinus cancer in 1971. He died at Claiborne Farm on July 12, 1971, and is interred there. In 1973, he was posthumously inducted into the National Museum of Racing and Hall of Fame. Bold Ruler was listed at No. 19 in the Blood-Horse magazine ranking of the top 100 United States thoroughbred horse racing champions of the 20th century. The Bold Ruler Handicap at Aqueduct is named in his honor.