View of San Marco basin in 1697
Places

Venice

Although no surviving historical records deal directly with the founding of Venice, tradition and the available evidence have led several historians to agree that the original population of Venice consisted of refugees—from nearby Roman cities such as Padua, Aquileia, Treviso, Altino, and Concordia (modern Portogruaro), as well as from the undefended countryside—who were fleeing successive waves of Germanic and Hun invasions.

Source