Jadanli broke a losing run lasting nearly three years to lift the Goffs Thyestes Chase at Gowran Park.
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Pulled up in the Welsh National at Chepstow on his most recent start, the 25/1 chance took up the running heading to the second-last fence and was clear over the last.
However, runner-up Tarquinius (25/1) threw down a determined challenge in the final 100 yards and only narrowly failed to scrape past the winner.
The inexperienced Panther Claw (8/1) emerged with considerable credit in third, while Sole Witness (16/1) filled out the places in fourth.
Well-backed favourite The Westerner Boy was an early casualty in the contest, sending Tony McCoy crashing to the ground, while Ruby Walsh's fears over Bishopfurze's jumping also proved justified as his mount was also out of the race from an early stage after a howling error unseated the jockey.
Paul Gilligan, who trains the winner for his father, Eamon, said: "His run in the Welsh National was absolutely super. I think better fancied horses than him pulled up before him. He deserved a win.
"He'll get an entry for the Irish National and I'll aim him towards that more so than Aintree. He'll also be entered there but the ground might be too good for him.
"We've had a rough time of it but it's a game that me, my wife Natalie and the kids love.
"We had some very good owners but also some bad ones and thankfully the very good ones have stuck with us through the years and I can't thank them enough."