The history of the settlement of Septèmes-les-Vallons is rooted in deep antiquity, with the first written mentions dating back to the 1st century AD. During the Roman era in France, this location already held significant strategic importance, situated just 11 kilometers north of Massilia (modern-day Marseille). The town's name derives from Latin and Occitan roots: Septèmes lo Valladas literally translates to "Seven Valleys," highlighting the area's picturesque hilly terrain.
Over the centuries, the development of Septèmes-les-Vallons has been closely linked to its geography. The settlement grew on the slopes of Le Petite Étoile mountain, using the valleys as natural communication routes. For a long time, it lacked administrative autonomy, remaining part of larger feudal estates. A major trial for local residents was the plague epidemic of 1720, which significantly slowed population growth but could not break the history of this resilient region.
A new chapter in the town's annals began after the French Revolution. In 1790, Septèmes-les-Vallons officially separated from the commune of Les Pennes-Mirabeau, becoming a fully independent entity. Later, in 1919, the clarifying suffix "les-Vallons" was added to its name, finally establishing the town's image as a cozy settlement sheltered in the valleys at the foot of the mountains.