Prince Metternich was one and he was born on May 15, 1773 in Koblenz, Germany and he died on June 11, 1859in Vienna, Austria. Charles Talleyrand was another, he was born on February 2, 1754, in Paris and died May 17, 1838. Lord Castlereagh was also, but Lord Castlereagh was not.
A.Lord Castlereagh is your answer.
Lord Castlereagh was not a leading figure at the Congress of Vienna.
Hoped I helped!
