Sarah Greville, Countess of Warwick British noble (1786–1851) Parents Elizabeth Stephenson John Savile, 2nd Earl of Mexborough Children George Greville, 4th Earl of Warwick Frederick John Monson, 5th Baron Monson Siblings John Savile, 3rd Earl of Mexborough Partners Henry Greville, 3rd Earl of Warwick John Monson, 4th Baron Monson