 Iberia was taken over by the Visigoths after 410.At the same time, there was a process of "Romanization" of the Germanic and Hunnic tribes settled on both sides of the "limes" (the fortified frontier of the Empire along the Rhine and Danube rivers).The Visigoths, for example, were converted to Arian Christianity around 360, even before they were pushed into imperial territory by the expansion of the Huns.