For ten points, name this city, currently Albania's primary port city on the southeastern shore of the Adriatic.
It was originally founded as a colony of the Greek island of Corcyra, and disputes with Corcyra set off the most devastating phase of the Peloponesian War.  In Byzantine times, it was the western terminus of the Via Aegenita, which started in Constantinople and ran through Thessalonica. As such, it was the landing point of Robert Guiscard's 1081 invasion of the Byzantine Empire.  For ten points, name this city, currently Albania's primary port city on the southeastern shore of the Adriatic.
It was originally founded as a colony of the Greek island of Corcyra, and disputes with Corcyra set off the most devastating phase of the Peloponesian War.  
Durres or Epidamnus or Dyrrachium or Durazzo