Answer:
Klemins Von Metternich, prince of Austria.
Step-by-step explanation:
The prince of Austria, Klemis Von Metternich was the most influential leader at the Vienna Congress held during 1814-1815. The prince was among the many ambassadors who had met regarding the peace plan for Europe.
Prince Metternich was of the opinion that the French aggressive nature must be prevented at all costs for the safety and security of the other European nations, advocated for the restoration of royalty in the European kingdoms and the division of power equally among the many leaders/ authorities. The French Revolutionary wars and the Napoleonic wars were some of the issues that led to this congress. Thus, the overall theme of the Congress was to find a peace solution for the European nations.