Final answer:
Klemens von Metternich was the most influential leader at the Congress of Vienna meeting in 1814.
Step-by-step explanation:
The most influential leader at the Congress of Vienna meeting in 1814 was Klemens von Metternich.
Klemens von Metternich was an Austrian politician and diplomat who played a crucial role in shaping the outcome of the Congress of Vienna. As the Austrian Foreign Minister, Metternich was the driving force behind the conservative, status quo agenda of the Congress. His diplomatic skills and political influence allowed him to promote the interests of Austria and preserve the balance of power in Europe following the Napoleonic Wars.
Metternich's ideas and principles, known as Metternichian diplomacy, had a lasting impact on European politics and paved the way for the conservative restoration that dominated much of the 19th century. His influence extended beyond the Congress of Vienna, as he continued to shape European affairs as a leading statesman for several decades.
Learn more about Congress of Vienna