Belgium–Luxembourg relations 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; a small part in the north is with the
Southern Netherlands Orange at the 1815 Congress of Vienna. The southeastern third of Luxembourg Province was made into the autonomous Grand Duchy of Luxembourg, because it was claimed by both the Netherlands and Prussia. In 1830 the predominantly Roman Catholic southern half became independent as the Kingdom of Belgium (the northern half being predominantly Calvinist). In 1839 the final border between the kingdom of the Netherlands and Belgium was determined and the eastern part of Limburg returned to the Netherlands as the province of Limburg. The autonomy of Luxembourg was recognised in 1839, but an instrument to that effect was not signed