(CNN) Billed as Britain's richest race, the Epsom Derby is the stand-out fixture on the social and sporting calendar.

And at this year's illustrious race, which invites the very best three-year-olds in thoroughbred racing to take one shot at winning, history could be made.

Acclaimed trainer Aidan O'Brien, described as a "genius" earlier this month when he became the first trainer in nearly 200 years to win the 2,000 Guineas three times in a row, is aiming to saddle a record-equaling seventh winner of the race.

The 13 runners and riders are now confirmed for Saturday's showpiece spectacle, which is run over a mile-and-a-half and carries a prize fund of at least $1.9 million, with the winner claiming just north of $1 million.

Held at Epsom Downs Racecourse every year since 1780, save from the World War years, the race is a rare test in terms of both speed and stamina.

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