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;
Monarchy of the Netherlands old republic as "sovereign prince". In 1815, after Napoleon escaped from Elba, William Frederick raised the Netherlands to the status of a kingdom and proclaimed himself King William I. As part of the rearrangement of Europe at the Congress of Vienna, the House of Orange-Nassau was confirmed as rulers of the Kingdom of the Netherlands, enlarged with what are now Belgium and Luxembourg. At the same time, William became hereditary Grand Duke of Luxembourg in exchange for ceding his family's hereditary lands in Germany to Nassau-Weilburg and Prussia. The Grand Duchy of Luxembourg was a part of the Netherlands (until