Aix-en-Provence (; Provençal Occitan: Ais de Provença in classical norm, or Ais de Prouvènço in Mistralian norm), or simply Aix (; medieval Occitan Aics), is a city-commune in the south of France, about north of Marseille. It is in the region of Provence-Alpes-Côte d'Azur, in the département of Bouches-du-Rhône, of which it is a subprefecture. The population of Aix numbers approximately 143,000. Its inhabitants are called Aixois or, less commonly, Aquisextains.
Aix (Aquae Sextiae) was founded in 123 BC by the Roman consul Sextius Calvinus, who gave his name to its springs, following the destruction of the nearby Gallic oppidum at Entremont. In 102 BC its neighbourhood was the scene of the Battle of Aquae Sextiae when Romans under Gaius Marius defeated the Cimbri and Teutones, with mass suicides among the captured women, which passed into Roman legends of Germanic heroism.
In the 4th century AD it became the metropolis of Narbonensis Secunda. It was occupied by the Visigoths in 477. In the succeeding century, the town was repeatedly plundered by the Franks and Lombards, and was occupied by the Saracens in 731 and by Charles Martel in 737. Aix, which during the Middle Ages was the capital of Provence, did not reach its zenith until after the 12th century, when, under the houses of Barcelona/Aragon and Anjou, it became an artistic centre and seat of learning.
Aix passed to the crown of France with the rest of Provence in 1487, and in 1501 Louis XII established there the parliament of Provence, which existed until 1789. In the 17th and 18th centuries, the town was the seat of the Intendance of Provence.