Colchester is 56 miles (90 km) northeast of London. It is connected to the capital by the A12 road and the Great Eastern Main Line.

Colchester is claimed to be the oldest recorded town in Britain on the grounds that it was mentioned by Pliny the Elder in AD 77. Its Celtic name was Camulodunon, meaning 'the fortress of (the war god) Camulos'. Following the Roman conquest of Britain in AD 43, a Roman legionary fortress was established and the name Camulodunon was modified to the Roman spelling of 'Camulodunum'. Camulodunum served as the first Roman capital of Britain, but was attacked and destroyed during Boudica’s rebellion in AD 61. Sometime after the destruction, London became the capital of the province of Britannia but it would seem that the council of the provincial natives still met at Colchester, where the Temple to the Divine Claudius served as the seat of this council. Later, when the Roman frontier moved north (c. AD 49), Camulodunum became a colonia known as Colonia Claudia Victricensis. In 2004 Colchester Archaeological Trust discovered the remains of a Roman Circus (chariot race track) underneath the Garrison in Colchester, a unique find in Britain.

Sub-Roman and Saxon Colchester

There is evidence of hasty re-organisation of Colchester's defences around 400AD, including the blocking of the Balkerne Gate. Archaeological excavations have shown that public buildings were abandoned, although the 8th-century chronicler Nennius mentioned the town, which he called Caer Colun, in his list of the 30 most important cities in Britain.

Dr. John Morris (1913 - June 1977) the English historian who specialised in the study of the institutions of the Roman Empire and the history of Sub-Roman Britain, suggested in his book "The Age of Arthur" (1973) that as the descendents of Romanised Britons looked back to a golden age of peace and prosperity under Rome the name "Camelot" of Arthurian legend was probably a reference to the capital of Britannia ( Camulodunum ) in Roman times.

The archaeologist Sir Mortimer Wheeler was the first to propose that the lack of early Anglo-Saxon finds in a triangle between London, Colchester and St Albans could indicate a 'sub-Roman triangle' where British rule continued after the arrival of the Anglo-Saxons. Since then however, excavations have revealed some early Saxon occupation, including a 5th-century wooden hut built on the ruins of a Roman house in present-day Lion Walk. The Saxons called the town Colne ceaster, the Roman fortress of 'Colonia'. The tower of Holy Trinity Church is late Saxon work. Vikings from East Anglia overran Colchester and most of Essex in the late 9th century; the town remained in Viking hands until 920 when it was besieged and recaptured by the army of Edward the Elder.