The Queen will be targeting historic success on Ladies' Day at Royal Ascot tomorrow, as her own horse - Estimate - runs in the Gold Cup.
Trained by Sir Michael Stoute, the filly is expected to go off as favourite for the feature race after winning at the meeting in Diamond Jubilee year.
Speaking to reporters about Estimate, Stoute said: "Her preparation has gone well. She enjoys Ascot, but this is much tougher than anything she has encountered before."
Estimate won the Queen's Vase last year, one of three races in which Her Majesty traditionally presents the trophy. She instead received the prize from her husband, the Duke of Edinburgh.
He will be absent this year, having only left hospital on Monday after an exploratory stomach operation.
The Queen has a total of 21 winners at Ascot, with her first victory coming in the Royal Hunt Cup, with Choir Boy, back in 1953.
Estimate's success last year was the first winner the Queen has had since the 2008 Chesham Stakes, when Free Agent claimed victory.
The Royal Hunt Cup takes place today, with tomorrow's Gold Cup proceeding Friday's Queen's Vase.
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