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Why was Bourbon France admitted to the main decision-making group at the Congress of Vienna?

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Watercolor etching by August Friedrich Andreas Campe showing diplomats and military officers in ornate uniforms gathered around a large table with maps at the Congress of Vienna. — Congress of Vienna *The Congress of Vienna*, watercolor etching by August Friedrich Andreas Campe; in the collection of the State Borodino War and History Museum, Moscow.

At the Congress of Vienna, the initial decision-making power was held exclusively by the four principal allied powers—Austria, Prussia, Russia, and Great Britain—who intended to manage the proceedings themselves.12

However, Charles-Maurice de Talleyrand, representing the restored Bourbon monarchy of France, challenged this exclusion. He argued that the congress should be a representative body and leveraged the support of smaller powers to protest the "four's" monopoly on decision-making.1

As the congress progressed, the four powers found themselves in disagreement over territorial issues, particularly regarding Poland and Saxony. Recognizing that the four were divided, Viscount Castlereagh of Great Britain and Klemens von Metternich of Austria gradually gained confidence in Talleyrand’s diplomatic position. Consequently, they insisted on admitting Bourbon France to the core group. This expanded committee of five became the true decision-making body of the congress, effectively settling the major territorial frontiers of Europe.132