Solution:The Congress of Vienna was held in 1815.
The gathering was among European ambassadors. Klemens von Metternich, an Austrian, served as the organisation's chairman. Restoring the lost peace in Europe was the primary goal of the Vienna Congress. The governance of Europe was upset by the French Revolution and the Napoleonic Wars because several significant problems developed. The long-running, nonstop battle of 23 years ended when Napoleon, who had dominated France for many years, was defeated. The Vienna Congress aimed to reduce the size of the powerful nations so that they could balance one another and promote world peace.