33-1 outsider Lion Na Bearnai gave trainer Tom Gibney his biggest success when winning the Ladbrokes Irish Grand National at Fairyhouse.
The ten-year-old was involved in a protracted duel with the strong-travelling Out Now (14-1) but battled on bravely to score under conditional rider Andrew Thornton.
Alfie Sherrin (10-1) fared best of the British raiders in third with Paddy Pub (20-1) fourth.
Gibney said: "I only have the five horses and this is unbelievable, just brilliant.
"The last day was the real shock and we were confident coming here but we were afraid to say it.
"Andrew is a brilliant rider - much under-rated and he gave him a copybook ride, the whole thing was copybook. He is only a pony and anyone could ride him at home."
Thornton added: "That's absolutely unbelievable and full credit to the horse.
"He is tough and he jumped like a stag. He is very gutsy and never put a foot wrong. I was squeezed for room at the fence in front of the stands but otherwise everything went great through the race."