Tattersalls International horse trials in Co Meath attracted more than 10,000 spectators, 17 Olympians and 328 horses from 14 countries at the weekend, directed by Hillsborough's veteran Olympic judge Jean Mitchell.
The Moneyreagh-owned Versace Biscuit won a second successive junior international event - last year with Katie Riley - and this year with Mullingar's Chloe Fagan.
Versace Biscuit, owned by Mr and Mrs Marshall Riley, finished on a dressage score of 24.8 to beat Jemima Stratton and Global H, runners up on 26 ahead of Ireland's Molly Neill on 29.8.
Catie Sleator of Newry on Grand Marnier finished 14th, just ahead of Bessbrook's European junior rider Lucy McIlroy who was runner-up at Tatts last year and slotted into 16th on Major Black.
Belfast's Rose Montmorency occupied 22nd place in a hotly contested class which saw many good riders drop down the leaderboard after faulting in the showjumping phase.
Jean Mitchell praised twins Lily and Sadie Keogh, who competed in the juniors.
"The twins have supported the northern region events in preparation for Tattersalls and it was great to see Lily take third and Sadie finish 21st. Junior riders will have impressed selectors for this year's European teams and Tattersalls was a great viewing weekend," she said.