The 1000 Guineas is a flat race deemed to be one of the five English Classics open to three-year-old fillies.

Along with the 2000 Guineas, Oaks, Derby and St Leger, it has Group One status and is the first leg of the Triple Crown for the fillies. If successful, they need to go on to win the Oaks at Epsom and the St Leger at Doncaster to complete the trio of races. The last horse to do so was Oh So Sharp in 1985.
The 1000 Guineas takes place in late April or early May at Newmarket Racecourse on the Rowley Mile. It is scheduled on the Sunday of the meeting and follows the colt's race, which takes place one day earlier.
In 1814, the first running of the Classic took place and was won by Charlotte, who was trained by Tom Perren and ridden by jockey Bill Clift. The race was named to reflect the prize money on offer for connections.
The most successful jockey in the history of the 1000 Guineas has been George Fordham as he has prevailed on seven occasions. He was on board Mayonaise in 1859 for his first winner, while 24 years later Hauteur brought up his seventh success in the Classic.
In the early 19th century, trainer Robert Robson had a reputation for doing well with his fillies; he scored nine times in the 1m race. Corrine was his first in 1818, which started a run of six consecutive victories. Catgut, Rowena, Zeal, Whitgig and Zinc all followed in her footsteps.
James Edwards stopped Robson's streak in 1824 when he trained Cobweb to victory. However, he returned with victories in 1825, 1826 and 1827 with Tontine, Problem and Arab, respectively. The 4th Duke of Grafton owned eight of those horses that were in the hands of Robson.
In 2009, Ghanaati recorded the fastest time on the Rowley Mile in the 1000 Guineas. She finished the trip in 1m 34.22s, while Mayonaise still has the record for the largest winning margin as he scored emphatically in 1859 by 20 lengths.
The longest odds winner of the Classic was Ferry in 1918. She produced an upset after going off at a starting price of 50/1. In 1840, Crucifix could only reward backers at 1/10. She has proved to be the shortest priced successor in the history of the fillies' race.
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