Alamannia or Alemannia was the territory inhabited by the Germanic Alemanni peoples after they broke through the Roman limes in 213.The Alemanni expanded from the Main River basin during the 3rd century, raiding Roman provinces and settling on the left bank of the Rhine River beginning in the 4th century. The territory corresponds to what was still the areal of Alemannic German in the modern period, i.e. French Alsace, German Baden and Swabia, German-speaking Switzerland and the Austrian Vorarlberg.