Belgium–Luxembourg relations German-speaking municipality of Burg-Reuland in the province of Liège. Belgium–Luxembourg relations Belgium–Luxembourg relations are the bilateral relations between the Kingdom of Belgium and Grand Duchy of Luxembourg. Both countries have a history of close cooperation, notably within the Belgium–Luxembourg Economic Union, Benelux and within the European Union. Belgium has an embassy in Luxembourg and Luxembourg has an embassy in Brussels. The Belgian ambassador to Luxembourg is Thomas Antoine. The Luxembourg ambassador to Belgium is Jean-Jacques Welfring. Belgium and Luxembourg share a land border. On the Belgian side of the border, nearly all of it is with the province of Luxembourg;
Military history of Luxembourg the predominantly francophone western part of the country was transferred to Belgium. Luxembourg's independence was reaffirmed by the 1839 First Treaty of London and again by the 1867 Second Treaty of London, after the Luxembourg Crisis nearly led to war between Prussia and France. The King of the Netherlands remained Head of State as Grand Duke of Luxembourg, maintaining personal union between the two countries until 1890. At the death of William III, the Dutch throne passed to his daughter Wilhelmina, while Luxembourg (at that time restricted to male heirs by the Nassau Family Pact) passed to Adolph of Nassau-Weilburg.