Because of its links with Gaul, Durovernum seems to have survived in good order until the Roman administration left around AD 410. However, after that, its decline was rapid. Mercenaries were hired to defend the town but they revolted. By the time of the Battle of Aylesford in the mid-5th century, the Jutes had taken over the area. The British and Latin name survived as the medieval Latin placename Dorobernia or Dorovernia, but the town also became known in Old Welsh as Cair Ceint ("Fortress of Kent") and in Old English as Cantwareburh ("Kentish Stronghold"), which developed into the modern "Canterbury".