Palace Episode produced a 20-1 surprise in the Racing Post Trophy at Doncaster.
The two-year-old colt was giving trainer Kevin Ryan and jockey Neil Callan a second Group One prize after the success of Amadeus Wolf in the Middle Park Stakes at Newmarket last month.
Palace Episode (9-2) took the lead a furlong out from the pacemaking Winged Cupid to win by a length and a half, with Septimus, the 5-6 favourite, a similar distance back in third.
Kevin Darley took the field over to the stands side on Winged Cupid and set out to make all the running.
Kilworth and Palace Episode were close up, although Septimus had to be kept up to his work by Kieren Fallon from an early stage.
Winged Cupid stuck to his task well in front but Palace Episode was always travelling well and once he got his nose in front, he galloped on strongly on the heavy ground.