The Holy Alliance (Heilige Allianz; Священный союз, Svjaščennyj sojuz; also called the Grand Alliance) was a coalition linking the monarchist great powers of Austria, Prussia and Russia, which was created after the final defeat of Napoleon at the behest of Emperor (Tsar) Alexander I of Russia and signed in Paris on 26 September 1815. The alliance aimed to restrain liberalism and secularism in Europe in the wake of the devastating French Revolutionary Wars and the Napoleonic Wars; it nominally succeeded in this until the Crimean War. Chancellor Otto von Bismarck managed to reunite the Holy Alliance following the unification of Germany in 1871, but the alliance again faltered by the 1880s over Austrian and Russian conflicts of interest over the dissolution of the Ottoman Empire.
Ostensibly, the alliance was formed to instil the divine right of kings and Christian values in European political life, as pursued by Alexander I under the influence of his spiritual adviser Baroness Barbara von Krüdener. It was written by the Tsar and edited by Ioannis Kapodistrias and Alexandru Sturdza. Under the treaty European rulers would agree to govern as "branches" of the Christian community and offer mutual service. In the first draft Tsar Alexander I made appeals to mysticism through a proposed unified Christian empire that was seen as disconcerting by the other monarchies. Following revision, a more pragmatic version of the alliance was adopted by Russia, Prussia, and Austria. The document was called "an apocalypse of diplomacy" by French diplomat Dominique-Georges-Frédéric Dufour de Pradt.
The agreement was at first secret, and mistrusted by liberals though liberalism was effectively restrained in this political culture until the Revolutions of 1848.
About three months after the Final Act of the Congress of Vienna, the monarchs of Catholic (Austria), Protestant (Prussia), and Orthodox (Russia) confession promised to act on the basis of "justice, love, and peace", both in internal and foreign affairs, for "consolidating human institutions and remedying their imperfections".