Lady Mary Campbell Peerage person ID=236742 Parents Archibald Campbell, 7th Earl of Argyll Agnes Douglas, Countess of Argyll Children Robert Montgomery of Montgomery, 3rd Bt. Siblings Annabella Campbell, Countess of Lothian Archibald Campbell, 1st Marquess of Argyll James Campbell, 1st Earl of Irvine Lady Mary Campbell Jane Gordon Anne Campbell Partners Sir Robert Montgomery of Montgomery, 2nd Bt.