| Ruler | |
|---|---|
| Sire | Young Marske |
| Grandsire | Marske |
| Dam | Flora |
| Damsire | Lofty |
| Sex | Stallion |
| Foaled | 1777 |
| Country | Great Britain |
| Colour | Bay |
| Breeder | William Bethell |
| Owner | William Bethell |
| Record | 5: 3-0-1 |
| Major wins | |
| St. Leger Stakes (1780) | |
Ruler (1777 – 4 February 1806) was a British Thoroughbred racehorse. He won three of his five starts, including the two-mile St. Leger Stakes in 1780. He was bred and owned by William Bethell.