The document discusses the Opera Riot in Brussels in 1830. It began during a performance of the opera La Muette de Portici, which featured patriotic themes. This sparked a rebellion against Dutch rule among the French-speaking Walloons. This rebellion led to the Belgian Revolution and eventual independence and separation of Flanders and Wallonia into distinct political entities with their own languages and military forces. It also discusses key figures in the revolution like Charles Latour Rogier, who became prime minister after helping lead the rebellion in Brussels.