In the 5th century BC, a Celtic refuge and place of worship was built on the Heiligenberg, or 'Holy Mountain'. In 40 AD a fort was built and occupied by the Romans.
Septeuil has been known in Mithriacism since 1984, when a sanctuary dedicated to Mithras was discovered in the 4th century. It was located in a spring sanctuary (nymphaeum) of the 1st century.
C’est en 1986, à l’occasion de la restructuration de l’ancien magasin Parunis, qu’une fouille de sauvetage archéologique fut réalisée cours Victor Hugo.
Around 300 BC, Burdigala was the settlement of a Celtic tribe, the Bituriges Vivisci. The Romans conquered the area in 60 BC and made Burdigala the capital of the Roman province of Aquitania during the reign of Emperor Vespasian.