What is Robert Stewart, Viscount Castlereagh?
'''Castlereagh''' (born in [[Dublin]]; 1769–1822) was a British [[politician]]. He became a [[Viscount]] when his father was made [[Earl]] of [[Londonderry]]. He became British [[Foreign Secretary]] but killed himself. {{Infobox officeholder | honorific-prefix = [[The Most Honourable]] | name = The Marquess of Londonderry | honorific-suffix = {{Postnominals|country=GBR|size=100%|KG|GCH|PC|PCi}} | image = Lord Castlereagh Marquess of Londonderry.jpg | caption = [[Lord Castlereagh (painting)|Portrait]] by [[Thomas Lawrence]], {{circa|1809–1810}} | order1 = [[Secretary of State for Foreign Affairs (UK)|Secretary of State for Foreign Affairs]] | term_start1 = 4 March 1812 | term_end1 = 12 August 1822 | primeminister1 = {{Ubl |[[Spencer Perceval]] | [[Robert Jenkinson, 2nd Earl of Liverpool|The Earl of Liverpool]] }} | predecessor1 = [[Richard Wellesley, 1st Marquess Wellesley|The Marquess Wellesley]] | successor1 = [[George Canning]] | order2 = [[Leader of the House of Commons]] | term_start2 = 8 June 1812 | term_end2 = 12 August 1822 | primeminister2 = The Earl of Liverpool | predecessor2 = Spencer Perceval | successor2 = George Canning | order3 = [[Secretary of State for War and the Colonies]] | term_start3 = 25 March 1807 | term_end3 = 1 November 1809 | primeminister3 = [[William Cavendish-Bentinck, 3rd Duke of Portland|The Duke of Portland]] | predecessor3 = [[William Windham]] | successor3 = The Earl of Liverpool | term_start4 = 10 July 1805 | term_end4 = 5 February 1806 | primeminister4 = [[William Pitt the Younger]] | predecessor4 = [[John Pratt, 1st Marquess Camden|The Earl Camden]] | successor4 = William Windham | order5 = [[President of the Board of Control]] | term_start5 = 2 July 1802 | term_end5 = 11 February 1806 | primeminister5