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Family and Education
b. 18 June 1769, He was baptized a Presbyterian at Strand Street, Dublin, 5 July 1769. 2nd but 1st surv. s. of Robert Stewart, MP [I], 1st mq. of Londonderry [I], of Mount Stewart and 1st w. Lady Sarah Frances Seymour Conway, da. of Francis, 1st mq. of Hertford. educ. R. Sch. Armagh 1777; by Rev. William Sturrock, Portaferry 1781; St. John’s, Camb. 1786; continental tour 1791-2. m. 9 June 1794, Lady Amelia Anne Hobart, da. and coh. of John Hobart†, 2nd earl of Buckinghamshire, s.p. styled. Visct. Castlereagh 8 Aug. 1796-6 Apr. 1821; KG 9 June 1814; GCH 1816; suc. fa. as 2nd mq. of Londonderry [I] 6 Apr. 1821. d. 12 Aug. 1822.
Offices Held

MP [I] 1790 – 1800.

Kpr. of privy seal [I] 1797 – 1801; ld. of treasury [I] 1797 – 1804; chief sec. to ld. lt. [I] Mar.-Nov. 1798 (ad. int.), 1798–1801; PC [I] 20 Oct. 1797, [GB] 19 Dec. 1798; pres. bd. of control July 1802 – Feb. 1806; sec. of state for war and colonies July 1805 – Feb. 1806, Mar. 1807 – Nov. 1809; sec. of state for foreign affairs Feb. 1812 – d.; plenip. at Chatillon 1813, Paris 1814, 1815, Vienna 1814 – 15, Aix-la-Chapelle 1818.

Lt.-col. co. Londonderry militia 1793, col. 1798 – d.; gov. co. Londonderry 1805, custos rot. 1821.

Parlimentarian
STEWART, Robert, Visct. Castlereagh (1769-1822), of Mount Stewart, co. Down; North Cray Farm, nr. Bexley, Kent and 9 St. James’s Square, Mdx.
Main residences: Mount Stewart, co. Down, [I] and North Cray Farm, nr. Bexley, Kent and 9 St. James’s Square, Mdx.
Notes

See the biographies by Ione Leigh (1951), C.J. Bartlett (1966) and Wendy Hinde (1981), and the survey by J.W. Derry (1976). For Castlereagh as foreign secretary and diplomat in the post-war period see Sir Charles Webster, The Foreign Policy of Castlereagh, 1815-1822 (1947).

Author
D.R.F.
Volume
Commons 1820-1832
Web Title

STEWART, Robert, Visct. Castlereagh (1769-1822)

Will
Estates
Oxford 1644
No
Addresses
Religion