Definition of Lord Castlereagh from the Oxford Advanced Learner's Dictionary

 

Lord Castlereagh

 
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born Robert Stewart (1769-1822) a British Tory politician who was responsible for the Act of Union with Ireland (1800). In 1809 he fought a duel (= a fight with guns to settle a quarrel) with his rival, Canning, and left the government. He returned as Foreign Secretary (1812-22). After the Napoleonic Wars he tried to keep the balance of power between European states.