. . . the Helvetii?

Of whom, "Orgetorix was by far the most distinguished and wealthy. He, when Marcus Messala and Marcus Piso were consuls, incited by lust of sovereignty, formed a conspiracy among the nobility, and persuaded the people to go forth from their territories with all their possessions, [saying] that it would be very easy, since they excelled all in valor, to acquire the supremacy of the whole of Gaul." (De Bello Gallico, Book One)