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 led to the Belgian Revolution and eventual independence and separation of Flanders and Wallonia into distinct political entities with their own languages and institutions. Charles Latour Rogier emerged as a leader of the revolution and later became prime minister of the newly independent Belgium.