What are Quadruple alliance?

The Quadruple Alliance was a coalition formed in 1815 among four major European powers: Austria, Prussia, Russia, and the United Kingdom. Its primary purpose was to maintain the balance of power in Europe after the defeat of Napoleon and to suppress any revolutionary movements that could threaten stability. The alliance aimed to ensure collective security and cooperation among its members, ultimately leading to a period of relative peace in Europe known as the Concert of Europe.