Dartmouth, owned by the Queen, won the Hardwicke Stakes at Royal Ascot despite a stewards’ inquiry.
The 10-1 chance, ridden by Olivier Peslier for trainer Sir Michael Stoute, was her first winner at the meeting for three years.
An inquiry was held after Dartmouth and Highland Reel came close together but the placings were unaltered.
It was a record-equalling 75th triumph at the meeting for Stoute, and a 23rd win for the Queen.
Nearly £130,000 in prize money goes to the winner, with the majority of this for the victorious owner.
The Queen’s racing advisor John Warren said: “It’s been a long week and there have been a few ups and downs.
“This is the Olympics (of racing) and even to have a runner here is huge. To end up with a winner is so fantastic.”
Meanwhile, jockey Ryan Moore sealed a Saturday treble when Twilight Son won the Diamond Jubilee Stakes after earlier victories on Churchill and Sir Isaac Newton.
Saturday results
14.30 The Chesham Stakes (Listed) 7f – Churchill 8/11 fav
15.05 The Wolferton Rated Stakes (Listed) 1 ¼m – Sir Isaac Newton 7-1
15.40 The Hardwicke Stakes (Group 2) 1 ½m – Dartmouth 10-1
16.20 The Diamond Jubilee Stakes (Group 1) 6f – Twilight Son 7-2
17.00 The Wokingham Stakes (Heritage Handicap) 6f – Outback Traveller 10-1
17.35 The Queen Alexandra Stakes (Conditions) 2m 6f – Commissioned 12-1
www.bbc.com