Owner Samuel Riddle with Man o" War, circa 1920.
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One man holds the rein of a horse, while another man stands beside the horse.

Credit: Courtesy of the State Museum of Pennsylvania

The owner-operator of a woolen mill in Delaware County, Samuel Riddle owned and bred some of the nation's finest race horses, including Man o' War (1917-1947), considered by most to be the greatest thoroughbred racehorse of all time. After a career in which he won 20 of 21 races, Man o' War sired more than 64 stakes winners and 200 other champions.

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