Durrës Castle is the fortified old city of Durrës, Albania. It is enclosed by city walls built in the late 5th century, and repaired and reinforced in the Middle Ages and early modern periods.
he castle was built by the Byzantine Emperor Anastasius I (r. 491–518), who came from Durrës (ancient Dyrrhachium). At the time, Anastasius made the city one of the most fortified cities on the Adriatic. The ancient walls were devastated in an earthquake in 1273, and had to be extensively repaired.