Although no surviving historical records deal directly with the founding of Venice,radition and the available evidence have led several historians to agree that the original population of Venice consisted of refugees from Roman cities near Venice such as Padua, Aquileia, Treviso, Altino and Concordia (modern Portogruaro) and from the undefended countryside, who were fleeing successive waves of Germanic and Hun invasions. Some late Roman sources reveal the existence of fishermen on the islands in the original marshy lagoons