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The name of Septème reflects its location: at the seventh milepost on the Roman road between Vienne and Milan. A Roman camp had been established here, on a hill overlooking the valley.
A castle was recorded here in the 11th century and the village developed next to it. During the second half of the 12th century, the site was encircled by a strong enceinte one kilometre in length with three gates. After the unification of Septème to Dauphiné, a more modern castle was constructed in the 14th and 15th centuries.
The village has grown beyond the original enceinte, and now extends as far as the river.