The most likely is probably John Madden, one of the leading American trainers and breeders of the first half of the 20th century.

Though it would be dangerous to assume that the 2000 Guineas at Newmarket today is a two-horse race, the leading candidates are both excellent examples of the saying. The Aidan O’Brien trained Australia is a son of Galileo – the best sire in the world by many yardsticks – out of Ouija Board, the Lord Derby owned and bred mare who won 10 races in a stellar racing career, with seven of these being at Group/Grade 1 level. Australia is the best of her quartet of winners to date.