Answer
von Metternich, Francis II's main chancellor at the Congress of Vienna, played a pivotal role in shaping the post-Napoleonic order in Europe. As a key figure in diplomacy, he championed the principles of conservatism and restoration, striving to preserve the balance of power and prevent revolutionary upheavals. Metternich's influence was instrumental in redrawing the political map of Europe and establishing a relatively peaceful era known as the Concert of Europe.