Aidan Patrick O'Brien is an Irish horse racing trainer. Since 1996, he has been the private trainer at Ballydoyle Stables near Rosegreen in County Tipperary for John Magnier and his Coolmore Stud associates. From Wikipedia
Aidan O'Brien secures his 11th victory in the Group One race as Ryan Moore guides Europe's champion two-year-old filly to redemption at the Curragh.
