 All of these peoples shared a common material culture, and so cannot be defined archaeologically.The Chauci originally centered on the Weser and Elbe, but in they expanded to the River Ems by expelling the neighboring Ampsivarii, whereby they gained a border with the Frisians to the west.The Romans referred to the Chauci living between the Weser and Elbe as the 'Greater Chauci' and those living between the Ems and Weser as the 'Lesser Chauci'.