Glanum was an oppidum, or fortified town in present day Provence, founded by a Celto-Ligurian people called the Salyes in the 6th century BCE. It became officially a Roman city in 27 BCE and was abandoned in 260 AD. It is located on the flanks of the Alpilles, a range of mountains in the Bouches-du-Rhône département, about 20 km south of the modern city of Avignon, and a kilometre south of Saint-Rémy-de-Provence. It is particularly known for two well-preserved Roman monuments of the 1st century B.C., known as les Antiques, a mausoleum and a triumphal arch .
Between the 4th and 2nd centuries BC, the Salyens, the largest of the Celto-Ligurian tribes in Provence, built a rampart of stones on the peaks that surrounded the valley of Notre_Dame-de-Laval, and constructed an oppidum, or fortified town, around the spring in the valley, which was known for its healing powers. A shrine was built at the spring to Glanis, a Celtic god. The town grew, and a second wall was built in the 2nd century BC.
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