| Polemarch | |
|---|---|
| Sire | The Tetrarch |
| Grandsire | Roi Herode |
| Dam | Pomace |
| Damsire | Polymelus |
| Sex | Stallion |
| Foaled | 1918[1] |
| Country | United Kingdom |
| Colour | Chestnut |
| Breeder | Charles Vane-Tempest-Stewart, 7th Marquess of Londonderry |
| Owner | Lord Londonderry |
| Trainer | R H Dewhurst Tom Green |
| Record | 16: 5-3-0 |
| Major wins | |
| Gimcrack Stakes (1920) Rous Plate (1920) Knowsley Dinner Stakes (1921) Great Northern Leger (1921) St Leger (1921) | |
Polemarch (1918 – after 1937) was a British Thoroughbred racehorse and sire. He showed considerable promise as a two-year-old in 1920 when he won the Gimcrack Stakes and the Rous Plate as well as finishing third in the Middle Park Stakes. In the following year he won the Knowsley Dinner Stakes and the Great Northern Leger but appeared to have been exposed as some way short of top class before he recorded a 50/1 upset victory in the St Leger. In 1922 he became increasingly temperamental and difficult to manage and failed to win or place in five starts. He was then sold and exported to Argentina where he had considerable success of a breeding stallion.