In the Iron Age, Essex was home to the Trinovantes. In AD 43 the Roman conquest of Britain saw Roman control established over Essex, with the centre of Roman power in Britain being, for a time, Colchester. The Boudiccan revolt saw Colchester razed, but it was rebuilt.

Following the collapse of Roman authority, Essex was settled by Saxons, and in the 6th century the kingdom of the East Saxons, from which Essex gets its name, emerged. The early East Saxons were pagan, but were converted to Christianity by Cedd, who is now the county's patron saint, in 653. Essex was frequently under the overlordship of other Anglo-Saxon kingdoms, and by the late 9th century had been absorbed by the kingdom of Wessex. In the mid 9th century Essex was conquered by Scandinavian invaders, and became part of the Danelaw, before being reconquered by Wessex in the early 10th century, and becoming part of the emergent kingdom of England. Colchester and Maldon established themselves as Essex's principal towns by the end of this period.

Essex has been part of England ever since, and has played a role in events such as the Peasant's Revolt of 1381, the Wars of the Roses and the Wars of the Three Kingdoms. Throughout the medieval era, Essex was one of the most densely populated and prosperous parts of England, in no small part thanks to the wool trade in which it was heavily involved. Chelmsford established itself as the county town, while Harwich emerged as a major port and naval base. Overseas, Essex people made major contributions to the colonisation of the Americas.

In the industrial era, the introduction of the railway saw the rise of several seaside resort towns throughout Essex, most notably Southend-on-Sea and Clacton-on-Sea. Meanwhile, the expansion of London saw parts of south-west Essex subsumed by Greater London, which would only become official with the London Government Act 1963.

The Second World War saw much military activity in Essex, with fighter airbases in the south of the country taking part in the Battle of Britain, and bomber airbases in the north contributing to the bombing of Germany. After the war, new towns were established at Basildon and Harlow, and Essex's economy increasingly became dependant on the London commute. The decline of seaside resorts across Britain hit Essex particularly hard, impoverishing areas such as Jaywick.

Iron Age In the Iron Age, Essex and parts of southern Suffolk were controlled by the local Trinovantes tribe. Their production of their own coinage marks them out as one of the more advanced tribes on the island, this advantage (in common with other tribes in the south-east) is probably due to the Belgic element within their elite. Their capital was the oppidum (a type of town) of Camulodunon (present-day Colchester), which had its own mint. The tribe were in extended conflict with their western neighbours, the Catuvellauni, and steadily lost ground. By AD 10 they had come under the complete control of the Catuvellauni, who took Colchester as their own capital.

Reigning from Camulodunon, Cunobelin was the most powerful of the Iron Age kings in Briton, and indeed was sometimes described in Roman sources as 'king of the Britons.' While open to Roman influence, Cunobelin seems to have retained a significant degree of independence.

Roman period Cunobelin's death in c. 40-43 provoked a succession crisis, in which his son Caractacus initially came out on top. The disputed succession, and the exile of Cunobelin's son Arminius, provided the Roman emperor Claudius with a pretext to invade Britain. The Roman invasion began in 43, with four legions supported by auxiliaries landing unopposed in Kent. From there, the Romans advanced towards the Thames, defeating the British at an unknown river-crossing, and again on the banks of the Thames. At the Thames, the Romans paused and awaited the arrival of Claudius, who personally lead the advance on, and capture of, Camulodunon.Mattingly, David (2006), p. 92-99

Claudius held a review of his invasion force on Lexden Heath where the army formally proclaimed him Imperator. The invasion force that assembled before him included four legions, mounted auxiliaries and an elephant corps – a force of around 30,000 men.Described in 'The Essex Landscape', by John Hunter, Essex Record Office, 1999. Chapter 4 At Camulodunon, the kings of eleven British tribes surrendered to Claudius, though not Caractacus, who would later lead the resistance against Roman rule in western Britain.Life in Roman Britain, Anthony Birley, 1964

A legionary fortress was built in Camulodunon in c. 43, to be followed in c. 49 by the establishment of a veteran colony there, known formally as 'Colonia Claudia Victricensis,' but more often as Camulodunum.Mattingly, David (2006), p. 269-271 It was initially the capital and most important city in Roman Britain, and in it was constructed a temple to the God-Emperor Claudius - the largest building of its kind in Roman Britain.Crummy, Philip (1997) City of Victory; the story of Colchester – Britain's first Roman town. Published by Colchester Archaeological Trust ()Wilson, Roger J.A. (2002) A Guide to the Roman Remains in Britain (Fourth Edition). Published by Constable. ()

The establishment of the Colonia is thought to have involved extensive appropriation of land from local people. This, and other grievances, led to the Trinovantes joining their northern neighbours, the Iceni, in the Boudiccan revolt. The rebels entered the city, and after a Roman last stand at the temple of Claudius, razed it, massacring many thousands. A Roman force attempting to relieve Colchester was destroyed in pitched battle. The rebels then proceeded to sack Londinium (London) and Verulamium (St Albans), before being defeated in battle. Contemporary sources claim revolt may have killed as many as 80,000 people. The Romans are likely to have ravaged the lands of the rebel tribes, so Essex will have suffered greatly.

Camulodunum was rebuilt after the revolt, though it is unclear if it was ever again capital, or if that role had passed to Londinium; Tacitus is ambiguous on the subject in c. 60. The city was home to the only Roman circus for chariot racing in Britain, a theatre opposite the Temple of Claudius, and historians have speculated an amphitheatre may also have been built there.Mattingly, David (2006), p. 278-285

Throughout this, the Trinovantes' identity persisted. Roman provinces were divided into civitas for local government purposes – with a civitas for the Trinovantes strongly implied by Ptolemy. Christianity is thought to have been flourishing among the Trinovantes in the fourth century, indications include the remains of a probable church at Colchester,Details on the church, Colchester Archaeologist website https://www.thecolchesterarchaeologist.co.uk/?p=34126 the church dates from sometime after 320, shortly after the Constantine the Great granted freedom of worship to Christians in 313. Other archaeological evidence include a chi-rho symbol etched on a tile at a site in Wickford, and a gold ring inscribed with a chi-rho monogram found at Brentwood. the reference relates to the flourishing nature of Christiantity in fourth century Essex and the finds at Wickford and Brentwood

The late Roman period, and the period shortly after, was the setting for the King Cole legends based around Colchester. One version of the legend concerns St Helena, the mother of Constantine the Great. The legend makes her the daughter of Coel, Duke of the Britons (King Cole) and in it she gives birth to Constantine in Colchester. This, and related legends, are at variance with biographical details as they are now known, but it is likely that Constantine, and his father, Constantius spent time in Colchester during their years in Britain. The source states that the earliest record in the 14th century Colchester Oath Book, but recounted by Daniel Defoe and others The presence of St Helena in the country is less certain.

From the early third century, Britain was increasingly subject to Saxon raids against coastal areas, including Essex. To protect against this threat, a series of forts were built along the coast, known as the Saxon Shore; one such fort was built in the late third century at Othona (present Bradwell-on-Sea).Mattingly, David (2006), p. 240-241

Roman authority in Britain entered a steep decline in the middle of the fourth century, culminating in the province's rejection of Constantine III in 409, following his withdrawal of troops from the province in 407. Outside of the Empire, the governing apparatus of Britain rapidly collapsed, ushering in a period of relative anarchy.Mattingly, David (2006), p. 529-527 Urban sites including Camulodunum were mostly abandoned, though there is some evidence of Saxon settlers among the ruins from early in the 5th century.Mattingly, David (2006), p. 532

Medieval period

Anglo-Saxon Essex

The first Saxons to settle in Essex were likely mercenaries, contracted by the Romano-British to garrison the Saxon Shore fortifications that protected the east coast against sea-borne raiders. Late Roman military belt sets, dating to the early 5th century, have been discovered in Essex, concentrated in coastal areas, including those with known military associations such as Colchester and Othona.

This accords with the earliest written account of post-Roman Britain, that of Gildas, which suggests the Anglo-Saxons first came to Britain as mercenaries, before turning on the Roman-British, and claiming much of the country for their own. The next written account comes from Bede in c. 731. Bede describes three principal groups - the Angles, Saxons, and Jutes - colonising England. The Saxon area he divides into the East, South (Sussex), and West Saxons (Wessex).Higham and Ryan (2013), p.72-76 It is from the Old English term for East Saxons, Ēastseaxe, that the name Essex derives. Archaeological evidence - primarily grave goods and burial practices - shows Essex as a region influenced both by 'Saxon' and 'Anglian' material culture, rather than conforming strongly to a Saxon identity.Mirrington, Alexander (2013), p. 270-283

The exact process by which Germanic, Anglo-Saxon identity, culture, and language became so widespread in England remains a subject of intense scholarly debate. The traditional view has been that there was large-scale migration from continental Europe to England. This is, however, contradicted by genetic evidence that suggests migration took place on a much smaller scale. Recent scholarship proposes lower levels and migration, alongside a cultural shift whereby Romano-British communities adopted the culture of an Anglo-Saxon elite, in order to gain "status, security, social opportunity and access to wealth."Higham and Ryan (2013), p.108-111

The kingdom of the East Saxons begins to emerge in the 6th century. It is at this time that elite burials first appear in Essex's archaeological record, most of which feature Kentish styles of dress and jewellery.Mirrington, Alexander (2013), p. 134-138 Some sources give the first king of the East Saxons as Æescwine (or Erkenwine) in 527, whose name suggests a connection with Kent. More widely attested as first king, however, is Sledd in 587. Again a Kentish connection is visible, as Sledd's wife Ricula was the sister of the Kentish king Æthelberht.Mirrington, Alexander (2013), p. 19-20 The early kings of the East Saxons were pagan and uniquely amongst the Anglo-Saxon kingdoms traced their lineage back to Seaxnēat, god of the Saxons, in addition to Woden. The kings of Essex are notable for their S-nomenclature, nearly all of them begin with the letter S.Yorke, Barbara. “The Kingdom of the East Saxons.” Anglo-Saxon England, vol. 14, 1985, pp. 1–36. JSTOR, http://www.jstor.org/stable/44509858. Accessed 12 Nov. 2024.