Camulodunum pavements. It may have reached a population of 30,000 at its height. It was not until the late 18th century that historians realised that Colchester's physical Brythonic (British Celtic) and Roman remains were the city mentioned in ancient literature as "Camulodunum". The earliest Iron Age defensive site at Colchester is the Pitchbury Ramparts earthwork north of the town between West Bergholt and Great Horkesley. The main earthwork defences of the Brythonic Celtic oppidum of "Camulodunon" were built later, beginning in the 1st century BC but most date from the 1st century AD. They are considered the most extensive of their
Camulodunum "Camulodensium" (although Lincoln and Gloucester are other possible candidates). The formal collapse of Roman administration in the province occurred in the years 409-411. Activity in the 5th century continued in Camulodunum at a much reduced level, with evidence of at the Butt Road site showing that it briefly carrying on into the early 5th century. Several burials within the towns walls have been dated to the 5th century. These include two burials discovered at East Hill House in 1983, which have been surgically decapitated (in a fashion found in both Pre-Roman and some early pagan-Saxon burial practices), and other burials