Coolmore Stud, in Fethard, County Tipperary, Ireland, is headquarters of the world's largest breeding operation of thoroughbred racehorses. Through its racing arm, Ballydoyle, Coolmore also has raced many classic winners and champions. The operation, which is currently owned and run by the Magnier family, has been associated with a long sequence of top-class stallions since the 1850s, originally in County Cork, where stallions still stand as part of Coolmore today.

Horse racing is an equestrian performance sport, typically involving two or more horses ridden by jockeys over a set distance for competition. It is one of the most ancient of all sports, as its basic premise – to identify which of two or more horses is the fastest over a set course or distance – has been mostly unchanged since at least classical antiquity.