Robert Stewart, Viscount Castlereagh

The Most Honourable

The Marquess of Londonderry

KG GCH PC PC (Ire)
The Most Honourable; The Marquess of Londonderry; KG GCH PC PC (Ire)
	Portrait by Thomas Lawrence, c. 1809–1810
Secretary of State for Foreign Affairs
	In office; 4 March 1812 – 12 August 1822
Prime Minister	Spencer Perceval; The Earl of Liverpool;
Preceded by	The Marquess Wellesley
Succeeded by	George Canning
Leader of the House of Commons
	In office; 8 June 1812 – 12 August 1822
Prime Minister	The Earl of Liverpool
Preceded by	Spencer Perceval
Succeeded by	George Canning
Secretary of State for War and the Colonies
	In office; 25 March 1807 – 1 November 1809
Prime Minister	The Duke of Portland
Preceded by	William Windham
Succeeded by	The Earl of Liverpool
	In office; 10 July 1805 – 5 February 1806
Prime Minister	William Pitt the Younger
Preceded by	The Earl Camden
Succeeded by	William Windham
President of the Board of Control
	In office; 2 July 1802 – 11 February 1806
Prime Minister	Henry Addington; William Pitt the Younger;
Preceded by	The Earl of Dartmouth
Succeeded by	The Lord Minto
Chief Secretary for Ireland
	In office; 14 June 1798 – 27 April 1801
Prime Minister	William Pitt the Younger
Lord Lieutenant	The Marquess Cornwallis
Preceded by	Thomas Pelham
Succeeded by	Charles Abbot
Personal details
Born	Robert Stewart; 18 June 1769; Dublin, Ireland
Died	12 August 1822 (aged 53); Woollet Hall, Kent, England, United Kingdom of Great Britain and Ireland
Cause of death	Suicide
Resting place	Westminster Abbey
Citizenship	Kingdom of Ireland; United Kingdom
Nationality	British
Political party	Whig (1790–1795); Tory (1795–1822);
Spouse(s)	Lady Amelia Hobart
Parents	Robert Stewart, 1st Marquess of Londonderry; Lady Sarah Frances Seymour-Conway
Alma mater	St. John's College, Cambridge
Signature

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.