The town began as an important trading settlement in Celtic times, straddling east-west and north-south trade routes across the Ardennes. The Romans established a presence after Julius Caesar defeated the local Aduatuci tribe.
Namur came to prominence during the early Middle Ages when the Merovingians built a castle or citadel on the rocky spur overlooking the town at the confluence of the two rivers. In the 10th century it became a county in its own right. The town developed somewhat unevenly, as the counts of Namur could only build on the north bank of the Meuse - the south bank was owned by the bishops of Li�ge and developed more slowly into the town of Jambes (now effectively a suburb of Namur). In 1262, Namur fell into the hands of the Count of Flanders, and was purchased by Duke Philip the Good of Burgundy in 1421.
After Namur became part of the Spanish Netherlands in the 1640s, its citadel was considerably strengthened. Louis XIV of France invaded in 1692, capturing the town and annexing it to France. His renowned military engineer Vauban rebuilt the citadel. French control was short-lived, as William III of Orange-Nassau captured Namur only three years later in 1695 during the War of the Grand Alliance. Under the Barrier Treaty of 1709, the Dutch gained the right to garrison Namur, although the subsequent Treaty of Utrecht of 1713 gave control of the formerly Spanish Netherlands to the Austrian House of Habsburg. Thus, although the Austrians ruled the town, the citadel was controlled by the Dutch. It was rebuilt again under their tenure.
France invaded the region again in 1794, during the French Revolutionary Wars, and again annexed Namur, imposing a repressive regime. After the defeat of Napoleon in 1815, the Congress of Vienna incorporated what is now Belgium into the United Kingdom of the Netherlands. Belgium broke away from the Netherlands in 1830 following the Belgian Revolution, and Namur continued to be a major garrison town
