In 1008, a terrible famine brought the Plague. According to the local tradition, the Virgin Mary held a cordon around the city which, miraculously, has since protected its people from the disease. Since then, every year at that time, the Valenciennois used to walk around the 14km road round the town, in what is called the tour of the Holy Cordon. Many Counts succeeded, first as Margraves of Valenciennes and from 1070 as counts of Hainaut.
In 1285, the currency of Hainaut was replaced by the currency of France: the ecu. Valenciennes was full of activity, with numerous corporations, and outside its walls a large number of convents developed, like that of the Dominicans (whose church was excavated by the Valenciennes Archaeological Service in 1989 and 1990).
In the 14th century, the Tower of Dodenne was built by Albert of Bavaria, where even today, the bell is rung in honour of Our Lady of the Holy Cordon. In the 15th century, the County of Hainault, of which Valenciennes is part, was re-attached to Burgundy, losing its autonomy. Valenciennes in this period, however, had several famous sons - the chronicler Georges Chastelain, the poet Jean Molinet, the miniaturist Simon Marmion, the sculptor Pierre du Préau and the goldsmith Jerome de Moyenneville).
In 1591, the Jesuits built a school and then the foundations of a church of Sainte-Croix. In 1611, the facade of the town hall was completely rebuilt in magnificent Renaissance style. In the seventeenth century the Scheldt was channelled between Cambrai and Valenciennes, benefitting Valenciennes' wool, fabric and fine arts. To use up flax yarn, women began to make the famous Valenciennes lace.
The French army laid siege to the city in 1656 (Vauban participated in this siege without a command). Defending the city, Albert de Merode, marquis de Trélon was injured during a sortie on horseback, died as a result of his injuries and was buried in the Church of St. Paul (his tomb was found during the archaeological campaign in 1990). In 1677, the armies of Louis XIV of France (this time led by Vauban) captured the city and in 1678 the Treaty of Nijmegen gave the French control of Valenciennes (1678) and the surrounding southern part of Hainault, roughly cutting the former county in half. The city became one of the main strongholds of northern France, and was fortified by Vauban, who personally visited the town for that purpose shortly after the Treaty.
During the Enlightenment era, the economic situation of Valenciennes was in decline until the discovery of coal. The first pit was dug in Fresnes in 1718 and the discovery of burnable coal in 1734 at the porte d'Anzin led to the formation of the Compagnie des Mines d'Anzin. In the eighteenth century, the city was equally renowned for its porcelain - indeed, it was the porcelain furnaces demand for coal that led to the mining enterprises. Despite their quality of production, the company failed to be sustainable. Valenciennes, rich in artistic talent, became known as the Athens of the North, underlining its artistic influence.
In 1824 Valenciennes became a sous-préfecture. In the 19th century, thanks to coal, Valenciennes became a great industrial centre and the capital of Northern France's steel industry.
On 6 August 1890, a law downgraded the town's fortified status, and so from 1891 to 1893, its fortifications were demolished. The town was granted the Légion d'honneur in 1900.
Another wartime personality of Valenciennes was Louise de Bettignies (born in Saint-Amand-les-Eaux), a pupil of the Ursulines in Valenciennes from 1890 to 1896. Fluent in four languages (including German), in 1915 she created and directed the main British intelligence network behind enemy lines, nearly 60 km from the front around Lille. Arrested at the end of September 1915, and imprisoned in Germany, she died of mistreatment in September 1918 two months before the Armistice and was posthumously awarded the Victoria Cross by the British government for her actions. It is estimated that she saved the lives of nearly a thousand British soldiers by the remarkably precise information she obtained. For example, it enabled the English to conduct the first aerial bombing of a train (that of Kaiser Wilhelm II, who came to visit the front at Lille), though both aircraft were not equipped with suitable viewfinders and so the raid narrowly missed its target. The German High Command, based in Brussels, then put all its efforts into neutralising the accursed network that allowed the English to see everything and know everything about this part of the front. Louise's arrest was associated with the escape of Szeck Alexandre, a young Austrian radio operator got out of Brussels in August 1915, allowing the English to get their hands on the secret German diplomatic code. This code was exploited by Secret Service Room 40 ("Room 40"), under the supervision of Sir Reginald Hall, and in January 1917 allowed the decipherment of the famous Zimmerman telegram, which triggered the United States's entry into the war in April 1917.
Valenciennes is historically renowned for its lace. Until the 1970s, the main industries were steel and textiles. Since their decline, reconversion attempts focus mainly on automobile production. In 2001, Toyota built its Western European assembly line for the Toyota Yaris in Valenciennes. Because of this and other changes, the average unemployment in the region is now lower than the national average.
On 15 July 2004 the Administrative Board of the European Union's Railway Agency held its first meeting in Phénix, with representatives of the 25 Member States and François Lamoureux, those days Director General for Energy and Transportation at the European Commission. Valenciennes was picked as the European Railway Agency headquarters in December 2003. International conferences are held in Lille.
Line #1 of the tramway was put into service on July 3, 2006. 9.5 km long, this tramway crosses the five communes in the Valenciennois Metropolitain area, at a cost of 242.75 million Euros.
Valenciennes is a subprefecture of the Nord département.
The Hindenburg Line ran through Valenciennes during World War I, leading to extensive destruction. Valenciennes was again almost completely destroyed during World War II, and has since been rebuilt in concrete.
A few surviving monuments are:
The "Beffroi", a large, pin-like monument 45 metres (148 ft) in height, was built in 2007, on the site of the former belfry, destroyed in 1843.