The Treaty of Vienna was signed in 1815 after the defeat of Napoleon Bonaparte. It aimed to restore stability in Europe by redrawing national boundaries and establishing a balance of power among the major European nations. The treaty sought to prevent future conflicts by ensuring that no single country would dominate the continent. Key decisions made at the Congress of Vienna included the restoration of monarchies and the establishment of the Holy Alliance between Russia, Austria, and Prussia. The treaty laid the groundwork for European diplomacy and cooperation, influencing international relations for decades to come.