Regret was a famous American thoroughbred racemare and the first of three female horses to ever win the Kentucky Derby.
Regret and owner Harry Payne Whitney
Harry Payne Whitney was an American businessman, thoroughbred horse breeder, and member of the prominent Whitney family.
Whitney in February 1924
J. Parks, Harry Payne Whitney, and F.S. von Stade, circa 1914
Whitney and his horse Regret
Gertrude Vanderbilt Whitney, in Vogue magazine, by Adolf de Meyer, January 15, 1917