In the 1st century BC, the Romans, after defeating the local tribes, created the province of Gallia Belgica. A gradual immigration by Germanic Frankish tribes during the 5th century, brought the area under the rule of the Merovingian kings. A gradual shift of power during the 8th century led the kingdom of the Franks to evolve into the Carolingian Empire. The Treaty of Verdun in 843 divided the region into Middle and Western Francia and therefore into a set of more or less independent fiefdoms which, during the Middle Ages, were vassals either of the King of France or of the Holy Roman Emperor. Many of these fiefdoms were united in the Burgundian Netherlands of the 14th and 15th centuries. Emperor Charles V extended the personal union of the Seventeen Provinces in the 1540s, making it far more than a personal union by the Pragmatic Sanction of 1549 and increased his influence over the Prince-Bishopric of Liège.

The Eighty Years' War (1568–1648) divided the Low Countries into the northern United Provinces (Belgica Foederata in Latin, the "Federated Netherlands") and the Southern Netherlands (Belgica Regia, the "Royal Netherlands"). The latter were ruled successively by the Spanish and the Austrian Habsburgs and comprised most of modern Belgium. This was the theatre of most Franco-Spanish and Franco-Austrian wars during the 17th and 18th centuries. Following the campaigns of 1794 in the French Revolutionary Wars, the Low Countries—including territories that were never nominally under Habsburg rule, such as the Prince-Bishopric of Liège—were annexed by the French First Republic, ending Austrian rule in the region. The reunification of the Low Countries as the United Kingdom of the Netherlands occurred at the dissolution of the First French Empire in 1815.

The 1830 Belgian Revolution led to the establishment of an independent, Catholic and neutral Belgium under a provisional government and a national congress. Since the installation of Leopold I as king in 1831, Belgium has been a constitutional monarchy and parliamentary democracy. Although the franchise was initially restricted, universal suffrage for men was introduced in 1893 (with plural voting until 1919) and for women in 1949. The main political parties of the 19th century were the Catholic Party and the Liberal Party, with the Belgian Labour Party emerging towards the end of the century. French was originally the single official language adopted by the nobility and the bourgeoisie. It progressively lost its overall importance as Dutch became recognized as well. This recognition became official in 1898 and in 1967 a Dutch version of the Constitution was legally accepted.

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History