The Kerrygold Irish Oaks is Ireland's fourth Classic of the season, and is unique to that of Britain - with the Derby and Oaks at different weekends of June and July.
The Oaks is a Group One open to three-year-old thoroughbred fillies, run over the mile-and-a-half distance at the Curragh Racecourse.
The event was established in Ireland in 1895, and was originally contested over a mile.
Extended to its present length in 1915, the field usually consists of horses who ran in the Epsom equivalent, of which several have won both races.
Most recently done by Enable, the Yorkshire Oaks could be the next stepping stone for the winner here, where Blue Bunting in 2011 was the last to do the double.
This year thirteen fillies will be going to post on Saturday - three from England and six from the stable of Aidan O'Brien, so let's look at some common trends.