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Lord Castlereagh

The Most Honourable
The Marquess of Londonderry
KG GCH PC PC
Lord Castlereagh Marquess of Londonderry.jpg
Secretary of State for Foreign Affairs
In office
4 March 1812 – 12 August 1822
Monarch George III
George IV
Prime Minister The Earl of Liverpool
Preceded by The Marquess Wellesley
Succeeded by George Canning
Leader of the House of Commons
In office
4 March 1812 – 12 August 1822
Monarch George III
George IV
Prime Minister The Earl of Liverpool
Preceded by Hon. Spencer Perceval
Succeeded by George Canning
Secretary of State for War and the Colonies
In office
1807–1809
Monarch George III
Prime Minister The Duke of Portland
Preceded by William Windham
Succeeded by The Earl of Liverpool
In office
1805–1806
Monarch George III
Prime Minister Hon. William Pitt the Younger
Preceded by The Earl Camden
Succeeded by William Windham
President of the Board of Control
In office
1802–1806
Monarch George III
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
1798–1801
Monarch George III
Prime Minister William Pitt the Younger
Preceded by Thomas Pelham, 2nd Earl of Chichester
Succeeded by Charles Abbot, 1st Baron Colchester
Personal details
Born 18 June 1769 (1769-06-18)
Dublin, Ireland
Died 12 August 1822 (1822-08-13) (aged 53)
Loring Hall, Kent, England, UK
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
Religion Presbyterian
Signature

Robert Stewart, 2nd Marquess of Londonderry, KG, GCH, PC, PC (18 June 1769 – 12 August 1822), usually known as Lord Castlereagh (/ˈkɑːsəlr/ KAH-sul-RAY), was an Irish/British statesman. As British Foreign Secretary, from 1812 he was central to the management of the coalition that defeated Napoleon and was the principal British diplomat at the Congress of Vienna. Castlereagh was also leader of the British House of Commons in the Liverpool government from 1812 until his suicide in August 1822. Early in his career, as Chief Secretary for Ireland, he was involved in putting down the Irish Rebellion of 1798 and was instrumental in securing the passage of the Irish Act of Union of 1800.


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