During 
          Attila the Hun's brutal Italian 
          invasion in 452, the population of the countryside fled before his 
          army. Many sought refuge on the small islands in the lagoons lining 
          the western coast of the Adriatic, augmenting the fisherman population 
          that already lived there.  
         Although many 
          of the refugees returned to their mainland homes after Attila's withdrawal, 
          the origin of the future island colossus of Venice is often traced to 
          the migration caused by Attila's invasion.