Chateau de Carcassonne

Carcassonne became strategically identified when Romans fortified the hilltop around 100 BC and eventually made it the colonia of Julia Carsaco, later Carcasum (the process of swapping consonant is a metathesis). The main part of the lower courses of the northern ramparts dates from Gallo-Roman times. In 462 the Romans officially ceded Septimania to the Visigothic king Theodoric II who had held Carcassonne since 453; he built more fortifications at Carcassonne, which was a frontier post on the northern marches: traces of them still stand. Theodoric is thought to have begun the predecessor of the basilica that is now dedicated to Saint Nazaire.

In 508 the Visigoths successfully foiled attacks by the Frankish king Clovis. Saracens from Barcelona took Carcassonne in 725, but King Pippin the Younger drove them away in 759-60; though he took most of the south of France, he was unable to penetrate the impregnable fortress of Carcassonne.

A medieval fiefdom, the county of Carcassonne, controlled the city and its environs. It was often united with the County of Razès. The origins of Carcassonne as a county probably lie in local representatives of the Visigoths, but the first count known by name is Bello of the time of Charlemagne. Bello founded a dynasty, the Bellonids, which would rule many honores in Septimania and Catalonia for three centuries.

In 1067 Carcassonne became the property of Raimond Bernard Trencavel, viscount of Albi and Nîmes, through his marriage with Ermengard, sister of the last count of Carcassonne. In the following centuries the Trencavel family allied in succession either with the counts of Barcelona or of Toulouse. They built the Château Comtal and the Basilica of Saint-Nazaire. In 1096 Pope Urban II blessed the foundation stones of the new cathedral, a Catholic bastion against the Cathar heretics.

Carcassonne became famous in its role in the Albigensian Crusades, when the city was a stronghold of occitan cathars. In August 1209 the crusading army of Simon de Montfort forced its citizens to surrender. After capturing Raymond-Roger de Trencavel and imprisoning and allowing him to die, Montfort made himself the new viscount. He added to the fortifications. Carcassonne became a border citadel between France and the kingdom of Aragon (Spain).

In 1240 Trencavel's son tried to reconquer his old domain but in vain. The city submitted to the rule of kingdom of France in 1247, and King Louis IX founded the new part of the town across the river. He and his successor Philip III built the outer ramparts.

Contemporary opinion still considered the fortress impregnable. During the Hundred Years' War, Edward the Black Prince failed to take the city in 1355, although his troops destroyed the Lower Town.

In 1659, the Treaty of Pyrenees transferred the border province of Roussillon to France, and Carcassonne's military significance was reduced.

Fortifications were abandoned, and the city became mainly an economic center that concentrated on the woollen textile industry, for which a 1723 source quoted by Fernand Braudel found it “the manufacturing center of Languedoc”