The territory was already inhabited in the Middle Paleolithic; Neanderthal prehistoric settlements have been found in the caves of Xaxixiloaga in Aussurucq and Etxeberri. At the end of the Neolithic the population had extended and assimilated knowledge from other peoples. There are protohistoric settlements that show a simple material life and a lifestyle dominated by migration. Rests of coins and other monetary artifacts have been found, proving the existence of an exchange economy in Soule, which very likely worked as an access point between Aquitaine—Novempopulania—in the north and the southern side of the Pyrenees.