Robert Stewart (1769-1822), Viscount Castlereagh, later s... 1817
Robert Stewart, 2nd Viscount Castlereagh, later 2nd Marqu... 1800
Robert Stewart, Viscount Castlereagh, 2nd Marquess of Lon... 1814
Frederick, Viscount Castlereagh, later 4th Marquess of Lo... 1823
Charles Stewart Henry Vane-Tempest-Stewart, Viscount Cast... 1924
Sir Charles Stewart Henry Vane-Tempest-Stewart, Viscount... 1914
