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 had been under Cunobelinus’ sons’ control surrendered without further bloodshed, Claudius accepting their submission in Camulodunon. As the stronghold of a major tribe in the south-east, Camulodunum held strategic importance. A Roman legionary fortress or "castrum", the first permanent legionary fortress to be built in Britain, was established within the confines of Camulodunon (which was latinised as "Camulodunum") following the successful invasion in 43, and was home to the Twentieth Legion. A smaller fort was built against the Iron Age earthworks close to the Gosbecks high-status farmstead, and was home to the Ala Primae Thracum ("First Wing of Thracians", a