Prince John (April 6, 1953 – January 26, 1979) was an American Thoroughbred racehorse called "one of the greatest broodmare sires of all time" by Bloodhorse magazine.
On behalf of Max Gluck, a New York clothing retailer and owner of Elmendorf Farm, trainer Walter Kelley bought Prince John for $14,300 at the 1954 Keeneland Summer Sale from breeder Mrs. Fannie Hertz.
[3] However, after his win over Needles and Career Boy in the October 29, 1955 Garden State Stakes in which he earned $157,918, the then-largest purse in racing history,[4] Prince John was touted as a favorite for the 1956 Kentucky Derby.
[6] In January 1956, Prince John was given 124 pounds in the Experimental Free Handicap ratings, third to Career Boy's 126 and second to the 125 assigned to Nail and Needles.
[8] His influence can be seen in the pedigree of racing greats such as Cigar, Makybe Diva, Rock of Gibraltar, Secreto, Dream Well, Six Perfections, A P Valentine, and others.