The Chester city walls are a system of largely intact defensive walls surrounding the strategically important English city of Chester. The city has been defended with walls since the foundation of the Deva Victrix fort on the site in 79. The current walls are mainly medieval and Victorian, although the earliest surviving sections date back to at least 120, and the most recent section was constructed as recently as 1966. The walls are a Grade I listed building, and have been designated as a scheduled monument. They are the most complete city walls in Great Britain.