| Horsename: | Imperatrix |
| Sire: | Alfred |
| Grandsire: | Matchem |
| Dam: | Old England mare |
| Damsire: | Old England |
| Sex: | Mare |
| Foaled: | 1779 |
| Country: | Great Britain |
| Colour: | Chestnut |
| Breeder: | John Pratt |
| Owner: | John Pratt |
| Record: | 2: 1-1-0 |
| Race: | St. Leger Stakes (1782) |
Imperatrix (foaled 1779) was a British Thoroughbred racehorse. She raced only twice, with her only win coming in the 1782 St. Leger Stakes. She was bred and owned by John Pratt. As a broodmare, Imperatrix produced nine foals.
Imperatrix was a chestnut mare bred by John Pratt and foaled in 1779. She was sired by Alfred, who was a son of Matchem. Alfred won several races at Newmarket, including the Clermont Cup and Grosvenor Stakes.[1] Imperatrix's dam was an unnamed daughter of the stallion Old England.
On 24 September 1782 at Doncaster Racecourse, Imperatrix won the two-mile St. Leger Stakes, beating Monk (the evens favourite), Nobleman and two others. In her only other race she finished second to Miss Kitty in the Port Stakes at Pickering, beating the eight other runners.[2]
Imperatrix then became a broodmare and produced nine foals, including at least three winners. They were:
There is no evidence that Imperatrix had any lasting influence on the Thoroughbred.
* Imperatrix was inbred 3x4 to Cade, the Godolphin Arabian and the Cullen Arabian. This means that all three stallions appear once in the third generation and once in the fourth generation of her pedigree.