Margaret Cecil, Countess of Salisbury English countess (d. 1682) Parents Frances Montagu John Manners, 8th Earl of Rutland Children Robert Cecil Lady Mildred Cecil Margaret Cecil James Cecil, 4th Earl of Salisbury Charles Cecil George Cecil Lady Frances Cecil Lady Catherine Cecil Lady Mary Cecil William Cecil Siblings Frances Cecil, Countess of Exeter Elizabeth Annesley, Countess of Anglesey Lady Grace Manners Dorothy Ashley-Cooper, Countess of Shaftesbury Lady Anne Manners John Manners, 1st Duke of Rutland Partners James Cecil, 3rd Earl of Salisbury