Castlereagh, Viscount The British statesman Robert Stewart Viscount Castlereagh and 2d Marquess of Londonderry (1769-1822), as foreign secretary did much to consolidate a firm final international alliance against Napoleon and to establish the framework for a remarkably durabl... more
Castlereagh, Robert Stewart, Viscount (born June 18, 1769, Dublin, Ire.—died Aug. 12, 1822, London, Eng.) British politician. He was elected to the Irish Parliament in 1790 and later served in the British Parliament (1794–1805, 1806–22). As chief secretary for Ireland (1798... more
