A treaty signed initially by Austria, Prussia, Russia, and Britain, and acceded to by France in 1818, confirming the 1815 Paris and Vienna provisions for 20 years. It was part of Castlereagh's scheme to guarantee peace through a permanent Concert of Europe.
The term "Quadruple Alliance" refers to several historical military alliances;
1- The Quadruple Alliance of 1674 was an alliance between the Holy Roman Empire, the Kingdom of Spain, the Electorate of Brandenburg, and the United Provinces of the Netherlands, in the context of the Franco-Dutch War.
2- The Quadruple Alliance of 1718 was an alliance between Austria, France, the Netherlands and Great Britain - aimed at revising (principally at Spain's expense) the treaties which ended the War of the Spanish Succession.
3- The Quadruple Alliance of 1745 was formed between the United Kingdom, the Netherlands, Saxony and Austria in the later stages of the War of the Austrian Succession.
5- The Quadruple Alliance of 1835 was formed by the United Kingdom, France, Spain and Portugal to support queen Isabella II of Spain against her uncle Don Carlos, Count of Molina, who claimed the Spanish throne under the succession law of 1714-1830.
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