What was the powerful foreign minister of Austria during the meeting of the five great powers of Europe?

The powerful foreign minister of Austria during the meetings of the five great powers of Europe, particularly at the Congress of Vienna in 1814-1815, was Klemens von Metternich. He played a crucial role in reshaping Europe after the Napoleonic Wars and was a key advocate for conservative restoration and balance of power. Metternich's diplomatic strategies significantly influenced European politics and the course of international relations in the 19th century.