Concert of Europe
The first phase of the Concert of Europe is typically described as beginning in 1814 with the Congress of Vienna, and ending in the early 1860s with the Prussian and Austrian invasion of Denmark. This first phase included numerous congresses, including the Congress of Paris in 1856 which some scholars argue represented the apex of the Concert of Europe in its ending of the Crimean War. At first, the leading personalities of the system were British foreign secretary Lord Castlereagh, Austrian chancellor and foreign minister Klemens von Metternich, and Emperor Alexander I of Russia. Charles Maurice de Talleyrand-Périgord of France was largely responsible for quickly returning the country to its place alongside the other major powers in international diplomacy.