Canterbury city walls are a sequence of defensive walls built around the city of Canterbury in Kent, England. The first city walls were built by the Romans, probably between 270 and 280 AD. These walls were constructed from stone on top of an earth bank, and protected by a ditch and wall towers. At least five gates were placed into the walls, linked to the network of Roman roads across the region. With the collapse of Roman Britain, Canterbury went into decline but the walls remained, and may have influenced the decision of Augustine to settle in the city at the end of the 6th century. The Anglo-Saxons retained the defensive walls, building chapels over most of the gates and using them to defend Canterbury against Viking incursions.