John Hayes St Leger

St Leger was brought in at Okehampton in 1790 on the interest of Francis Russell, 5th Duke of Bedford, in an election complicated by a double return.

[6] St Leger was one of a group of close companions of George, Prince of Wales, who shared an interest in prizefighting.

[3][9] He also associated with Charles Manners, 4th Duke of Rutland at Dublin Castle, pursuing in a public way his wife Mary Isabella; after the Duke's death in 1787 they were lovers..[3] The author Frances Burney wrote in her diary for 1787 of encountering the three colonels of the Prince's entourage, Samuel Hulse, Lake and St Leger.

Finding the "celebrated" St Leger subdued to the point of silence with his good friend Lake, she surmised they might have feared being put in a novel.

His estate at Park Hill, near Rotherham, passed to his brother Anthony Butler St Leger.