| 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 |
| Major wins | |
| 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.