Winifreda was a British Thoroughbred racehorse and broodmare. After winning the Richmond Stakes on her only start as a juvenile she took the 1000 Guineas on her three-year-old debut. She disappointed when favourite for the Epsom Oaks but returned to form to win the Coronation Stakes at Royal Ascot. Her career was then interrupted by health problems and she was well beaten in two subsequent races. She made no impact as a broodmare.

St. Simon was an undefeated British Thoroughbred racehorse and one of the most successful sires in the history of the Thoroughbred. In May 1886 The Sporting Times' carried out a poll of one hundred experts to create a ranking of the best British racehorses of the 19th century. St. Simon was ranked fourth, having been placed in the top ten by 53 of the contributors.