According to tradition, the original population of the region consisted of refugees—from nearby Roman cities such as Padua, Aquileia, Treviso, Altino, and Concordia (modern Concordia Sagittaria), as well as from the undefended countryside—who were fleeing successive waves of Hun and Germanic invasions from the mid-second to mid-fifth centuries. This is further supported by documentation on the so-called "apostolic families", the twelve founding families of Venice who elected the first doge, who in most cases traced their lineage back to Roman families.