In 1830, what is now Belgium was part of the United Kingdom of the Netherlands, a fusion of territories brought about in the wake of the Napoleonic Wars once belonging to the Dutch Republic, Austrian Netherlands, and Prince-Bishopric of Liège. A Constitutional Monarchy, ruled by the first King of the Netherlands, King William I.
The “Southern Provinces” of King William’s polity were almost all Catholic and mostly French speaking, in contrast with the Dutch speaking, mostly Protestant north.
Many southern liberals of the time thought King William a despot and tyrant. Meanwhile high levels of industrial unemployment made for widespread unrest among the working classes.
La Muette de Portici (The Mute Girl of Portici) is an opera in five acts by Daniel Auber. Generally recognized as the earliest of the French Grand Opera, La Muette was first performed at the Paris Opéra on February 29, 1828. During one performance a riot broke out during a particularly patriotic duet, Amour sacré de la patrie, (Sacred love of Fatherland).
It was August 25, 1830.
Soon the melee was spilling out onto the street, a full-scale riot spreading across Brussels and igniting other riots as shops were looted, factories occupied and machinery destroyed.
King William committed troops to the southern provinces in an effort to restore order, while radicals asserted control of rioting factions and began talk of secession. Meanwhile Dutch military units experienced massive desertion of recruits from the southern provinces, and had to pull out.
The States-General in Brussels voted in favor of secession and declared independence, assembling a National Congress while King William appealed to the Great Powers for help. The resulting 1830 London Conference of major European powers came to recognize Belgian independence. Leopold I was installed as “King of the Belgians”.
King William made one more attempt to reconquer Belgium, in 1831. France intervened with troops of its own and the “Ten Days’ Campaign” ended in failure. The European powers signed the “Treaty of London” in 1839, recognizing and guaranteeing Belgium’s independence and neutrality.
By this instrument Great Britain, Austria, France, the German Confederation led by Prussia, Russia and the Netherlands had formally recognized the independent Kingdom of Belgium.
The German Composer Wilhelm Richard Wagner remarked on the events decades later, saying that “[S]eldom has an artistic product stood in closer connection with a world-event”.
In 1914, Germany’s plan in the event of war could be likened to one guy against two in a bar fight. The plan was to take out the nearer one first (France), before turning to face the slow-moving behemoth, of Imperial Russia. The only obstacles were the neutral states of Belgium, and Luxembourg.
Believing Great Britain would remain on the sidelines, Kaiser Wilhelm’s Germany declared war on Belgium on August 4, beginning a great sweep through Belgian territory into France. The government of British Prime Minister Herbert Asquith would never honor that “scrap of paper” signed back in 1839.
In this German assumptions were grievously mistaken. Great Britain declared war within hours of the German invasion.
A regional squabble begun that June with the assassination of an Archduke would plunge the world into war, in August. Two world wars, really, with a 20-year break to grow a new generation, in-between.
Historical Easter Eggs - Today in History 
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