Ishvana bounced back from a lacklustre effort in the Leopardstown 1000 Guineas Trial when taking the Bookings At dundalkstadium.com Race.
Aidan O'Brien's 6-1 chance tracked early leader Piri Wango in the early stages, before taking up the running just after the two furlong pole.
Favourite Slade-Power&prt=422346">Slade Power angled out for a big run down the outside, but Ishvana fended him off under Joseph O'Brien, winning by half a length.
O'Brien junior made it a double in the Dundalk Stadium On Facebook Handicap when getting up late on Joanna Morgan's Six Silver Line.
Slim Chance looked to have it when still in front at the furlong pole, but O'Brien hit top gear on the 14-1 chance and the grey had enough to see off Naoise's late challenge by a neck.
Sli Na Fiarana showed plenty of courage to fend off favourite Train Of Thought and land the Follow Dundalk On Facebook Maiden.
Wayne Lordan pushed the Denise Foster-trained 4-1 chance into the lead over a furlong out, though the market leader was breathing down her neck and appeared to be travelling better.
Dermot Weld's charge never managed to get on terms, though, as Sli Na Fiarana responded well to Lordan's urgings to win by a length and a quarter.
The Kieran Cotter-trained Oonagh produced a gutsy front-running display to land the Irish Stallion Farms EBF Fillies Maiden.
The 3-1 chance was smartly away under Sam James and kept on galloping, so even though Attire barged her way through some traffic problems to mount a challenge, she was never going to catch the winner.
James' mount ran on well to record a two-length verdict over Attire, with La Oliva third.
Michael Grassick's Elusive In Paris (4-1 favourite) landed the dundalkstadium.com Handicap under Niall McCullagh, while the jockey added a second winner of the night when the heavily-backed Misty Lane (9-2) took the Louth Handicap.