10/20/2005 12:00AM

O'Brien has fearsome foursome in Racing Post

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Trainer Aidan O'Brien will have four runners at Doncaster on Saturday in the one-mile $370,000 Racing Post Trophy, England's final Group 1 juvenile test of the year.

So powerful are O'Brien's 2-year-olds this year that his foursome Saturday does not include George Washington or Horatio Nelson, the pair who sit atop the European juvenile standings, or Ivan Denisovich, his Breeders' Cup Juvenile-bound Group 2 winner.

O'Brien's first-string rider, Kieren Fallon, has chosen the undefeated Septimus in the Racing Post, which is named for and sponsored by Britain's daily racing paper. By Sadler's Wells, Septimus took the one-mile Group 2 Beresford Stakes at the Curragh on Oct. 9 and looks ready to emulate three previous O'Brien-trained winners of this race, Saratoga Springs, High Chaparral, and Brian Boru.

Jamie Spencer has been named aboard Arabian Prince, a Fusaichi Pegasus colt who was a length third last time in the Group 3 Autumn Stakes at Salisbury. More dangerous is Johnny Murtagh's mount, Dylan Thomas, a son of Danehill who was a neck second in the Autumn. Colm O'Donoghue rides Mountain, a Montjeu colt who was second in a one-mile Navan maiden in his debut.

O'Brien's foursome will have five challengers. Chief among them are Winged Cupid, an unbeaten one-mile allowance winner, and Palace Episode, who was third to Breeders' Cup Juvenile pre-entry Leo in the Group 2 Royal Lodge Stakes before finishing fifth last Saturday in the Group 1 Dewhurst Stakes.