Jack Of Trumps was one of the first horses that jp mcmanus owned.
Answer: Jack Of Trumps was brought over from Ireland to the Cheltenham Festival by J P McManus in 1978. He ran in the 4m National Hunt Chase, starting at odds on but fell at the 15th fence. He was trained by Edward O'Grady.
The horse certainly did not run at Down Royal in 1978 but I have not been able to ascertain whether he did so during the course of his career.