castlereagh

noun

1. Robert Stewart, Viscount2nd Marquess of Londonderry, 1769–1822, British statesman.

noun

1. a district of E Northern Ireland, in Co Down. Pop: 66 076 (2003 est). Area.: 85 sq km (33 sq miles)

noun

1. Viscount. title of Robert Stewart, Marquis of Londonderry. 1769–1822, British statesman: as foreign secretary (1812–22) led the Grand Alliance against Napoleon and attended the Congress of Vienna (1815)