Definition of Castlereagh, Viscount in English:

Castlereagh, Viscount

proper noun

  • (1769–1822), British Tory statesman; born Robert Stewart. He became Foreign Secretary in 1812 and represented Britain at the Congress of Vienna (1814–15).

Pronunciation:

Castlereagh, Viscount

/ˈkɑːs(ə)lreɪ/