Roman Britain

History

Early contact

Britain had trading links with the Mediterranean world for centuries before the Roman conquest. The tin deposits in Cornwall and Devon in the southwest of Britain are one of the richest in Europe. Tin was used to make bronze and Britain played an important role in supplying it during the Bronze Age.

Diodorus Siculus claims in Bibliotheca Historica that the centre of the tin trade was the island of Ictis. This claim is likely transmitted via Posidonius from a now lost text by the Greek explorer Pytheas who travelled to Britain around 320 BC.

Britain was regarded as a place of mystery, with some writers such as Strabo, doubting it existed. Herodotus had heard of Cassiterides, or “tin islands” which may have been Britain, but he did not know if they were real.

The first direct Roman contact was when Julius Caesar undertook two expeditions in 55 and 54 BC, as part of his conquest of Gaul, believing the Britons were helping the Gallic resistance. The first expedition was more a reconnaissance than a full invasion and gained a foothold on the coast of Kent but was unable to advance further because of storm damage to the ships and a lack of cavalry. Despite the military failure, it was a political success, with the Roman Senate declaring a 20-day public holiday in Rome to honour the unprecedented achievement of obtaining hostages from Britain and defeating Belgic tribes on returning to the continent.

The second invasion involved a substantially larger force and Caesar coerced or invited many of the native Celtic tribes to pay tribute and give hostages in return for peace. A friendly local king, Mandubracius, was installed, and his rival, Cassivellaunus, was brought to terms. Hostages were taken, but historians disagree over whether any tribute was paid after Caesar returned to Gaul.

Caesar conquered no territory and left no troops behind, but he established clients and brought Britain into Rome's sphere of influence. Augustus planned invasions in 34, 27 and 25 BC, but circumstances were never favourable, and the relationship between Britain and Rome settled into one of diplomacy and trade. Strabo, writing late in Augustus's reign, claimed that taxes on trade brought in more annual revenue than any conquest could. Archaeology shows that there was an increase in imported luxury goods in southeastern Britain. Strabo also mentions British kings who sent embassies to Augustus, and Augustus's own Res Gestae refers to two British kings he received as refugees. When some of Tiberius's ships were carried to Britain in a storm during his campaigns in Germany in 16 AD, they came back with tales of monsters.

Roman invasion

The invasion force in 43 AD was led by Aulus Plautius, but it is unclear how many legions were sent. The Legio II Augusta, commanded by future emperor Vespasian, was the only one directly attested to have taken part. The Legio IX Hispana, the XIV Gemina (later styled Martia Victrix) and the XX (later styled Valeria Victrix) are known to have served during the Boudican revolt of 60/61 AD, and were probably there since the initial invasion. This is not certain because the Roman army was flexible, with units being moved around whenever necessary. The IX Hispana may have been permanently stationed, with records showing it at Eboracum (York) in 71 AD and on a building inscription there dated 108 AD, before being destroyed in the east of the Empire, possibly during the Bar Kokhba revolt.

The invasion was delayed by a troop mutiny until an imperial freedman persuaded them to overcome their fear of crossing the Ocean and campaigning beyond the limits of the known world. They sailed in three divisions, and probably landed at Richborough in Kent; at least part of the force may have landed near Fishbourne, West Sussex.

The Catuvellauni and their allies were defeated in two battles: the first, assuming a Richborough landing, on the river Medway, the second on the river Thames. One of their leaders, Togodumnus, was killed, but his brother Caratacus survived to continue resistance elsewhere. Plautius halted at the Thames and sent for Claudius, who arrived with reinforcements, including artillery and elephants, for the final march to the Catuvellaunian capital, Camulodunum (Colchester). Vespasian subdued the southwest, Cogidubnus was set up as a friendly king of several territories, and treaties were made with tribes outside direct Roman control.

Establishment of Roman rule

After capturing the south of the island, the Romans turned their attention to what is now Wales. The Silures, Ordovices and Deceangli remained implacably opposed to the invaders and for the first few decades were the focus of Roman military attention, despite occasional minor revolts among Roman allies like the Brigantes and the Iceni. The Silures were led by Caratacus, and he carried out an effective guerrilla campaign against Governor Publius Ostorius Scapula.

In 51 AD, Ostorius lured Caratacus into a set-piece battle and defeated him. The British leader sought refuge among the Brigantes, but their queen, Cartimandua, proved her loyalty by surrendering him to the Romans. He was brought as a captive to Rome, where a dignified speech he made during Claudius's triumph persuaded the emperor to spare his life. The Silures were still not pacified, and Cartimandua's ex-husband Venutius replaced Caratacus as the most prominent leader of British resistance.

On Nero's accession, Roman Britain extended as far north as Lindum. Gaius Suetonius Paulinus, the conqueror of Mauretania (modern day Algeria and Morocco), then became governor of Britain, and in 60 and 61 he moved against Mona (Anglesey) to settle accounts with Druidism once and for all. Paulinus led his army across the Menai Strait and massacred the Druids and burnt their sacred groves.

While Paulinus was campaigning in Mona, the southeast of Britain rose in revolt under the leadership of Boudica. She was the widow of the recently deceased king of the Iceni, Prasutagus. The Roman historian Tacitus reports that Prasutagus had left a will leaving half his kingdom to Nero in the hope that the remainder would be left untouched. He was wrong. When his will was enforced, Rome responded by violently seizing the tribe's lands in full. Boudica protested. In consequence, Rome punished her and her daughters by flogging and rape. In response, the Iceni, joined by the Trinovantes, destroyed the Roman colony at Camulodunum (Colchester) and routed the part of the IXth Legion that was sent to relieve it.

Paulinus rode to London (then called Londinium), the rebels' next target, but concluded it could not be defended. Abandoned, it was destroyed, as was Verulamium (St. Albans). Between seventy and eighty thousand people are said to have been killed in the three cities. But Paulinus regrouped with two of the three legions still available to him, chose a battlefield, and, despite being outnumbered by more than twenty to one, defeated the rebels in the Battle of Watling Street. Boudica died not long afterwards, by self-administered poison or by illness. During this time, the Emperor Nero considered withdrawing Roman forces from Britain altogether.

Occupation of and retreat from southern Scotland

There is no historical source describing the decades that followed Agricola's recall. Even the name of his replacement is unknown. Archaeology has shown that some Roman forts south of the Forth–Clyde isthmus were rebuilt and enlarged; others appear to have been abandoned. By 87 the frontier had been consolidated on the Stanegate. Roman coins and pottery have been found circulating at native settlement sites in the Scottish Lowlands in the years before 100, indicating growing Romanisation. Some of the most important sources for this era are the writing tablets from the fort at Vindolanda in Northumberland, mostly dating to 90–110. These tablets provide evidence for the operation of a Roman fort at the edge of the Roman Empire, where officers' wives maintained polite society while merchants, hauliers and military personnel kept the fort operational and supplied.

Around 105 there appears to have been a serious setback at the hands of the tribes of the Picts: several Roman forts were destroyed by fire, with human remains and damaged armour at Trimontium (at modern Newstead, in SE Scotland) indicating hostilities at least at that site. There is also circumstantial evidence that auxiliary reinforcements were sent from Germany, and an unnamed British war of the period is mentioned on the gravestone of a tribune of Cyrene. Trajan's Dacian Wars may have led to troop reductions in the area or even total withdrawal followed by slighting of the forts by the Picts rather than an unrecorded military defeat. The Romans were also in the habit of destroying their own forts during an orderly withdrawal, in order to deny resources to an enemy. In either case, the frontier probably moved south to the line of the Stanegate at the Solway–Tyne isthmus around this time.

A new crisis occurred at the beginning of Hadrian's reign (117): a rising in the north which was suppressed by Quintus Pompeius Falco. When Hadrian reached Britannia on his famous tour of the Roman provinces around 120, he directed an extensive defensive wall, known to posterity as Hadrian's Wall, to be built close to the line of the Stanegate frontier. Hadrian appointed Aulus Platorius Nepos as governor to undertake this work who brought the Legio VI Victrix legion with him from Germania Inferior. This replaced the famous Legio IX Hispana, whose disappearance has been much discussed. Archaeology indicates considerable political instability in Scotland during the first half of the 2nd century, and the shifting frontier at this time should be seen in this context.

Third century

The death of Commodus put into motion a series of events which eventually led to civil war. Following the short reign of Pertinax, several rivals for the emperorship emerged, including Septimius Severus and Clodius Albinus. The latter was the new governor of Britannia, and had seemingly won the natives over after their earlier rebellions; he also controlled three legions, making him a potentially significant claimant. His sometime rival Severus promised him the title of Caesar in return for Albinus's support against Pescennius Niger in the east. Once Niger was neutralised, Severus turned on his ally in Britannia; it is likely that Albinus saw he would be the next target and was already preparing for war.

Albinus crossed to Gaul in 195, where the provinces were also sympathetic to him, and set up at Lugdunum. Severus arrived in February 196, and the ensuing battle was decisive. Albinus came close to victory, but Severus's reinforcements won the day, and the British governor committed suicide. Severus soon purged Albinus's sympathisers and perhaps confiscated large tracts of land in Britain as punishment. Albinus had demonstrated the major problem posed by Roman Britain. In order to maintain security, the province required the presence of three legions, but command of these forces provided an ideal power base for ambitious rivals. Deploying those legions elsewhere would strip the island of its garrison, leaving the province defenceless against uprisings by the native Celtic tribes and against invasion by the Picts and Scots.

The traditional view is that northern Britain descended into anarchy during Albinus's absence. Cassius Dio records that the new Governor, Virius Lupus, was obliged to buy peace from a fractious northern tribe known as the Maeatae. The succession of militarily distinguished governors who were subsequently appointed suggests that enemies of Rome were posing a difficult challenge, and Lucius Alfenus Senecio's report to Rome in 207 describes barbarians "rebelling, over-running the land, taking loot and creating destruction". In order to rebel, of course, one must be a subject – the Maeatae clearly did not consider themselves such. Senecio requested either reinforcements or an Imperial expedition, and Severus chose the latter, despite being 62 years old. Archaeological evidence shows that Senecio had been rebuilding the defences of Hadrian's Wall and the forts beyond it, and Severus's arrival in Britain prompted the enemy tribes to sue for peace immediately. The emperor had not come all that way to leave without a victory, and it is likely that he wished to provide his teenage sons Caracalla and Geta with first-hand experience of controlling a hostile barbarian land.

Fourth-century government

In a reform carried out by 312, the Diocese of Britain was divided into four provinces, Maxima Caesariensis, Flavia Caesariensis, Britannia Prima and Britannia Secunda. The diocese was governed by a vicarius, and Britain was part of the Gallic region under the overall authority of a praetorian prefect, based at Trier.

The vicarius was based at Londinium as the principal city of the diocese. Londinium and Eboracum continued as provincial capitals and the territory was divided up into smaller provinces for administrative efficiency.

Civilian and military authority of a province was no longer exercised by one official, and the governor was stripped of military command, which was handed over to the Dux Britanniarum by 314. The governor of a province assumed more financial duties (the procurators of the Treasury ministry were slowly phased out in the first three decades of the 4th century). The Dux was commander of the troops of the Northern Region, primarily along Hadrian's Wall, and his responsibilities included protection of the frontier. He had significant autonomy due in part to the distance from his superiors.

The tasks of the vicarius were to control and coordinate the activities of governors; monitor but not interfere with the daily functioning of the Treasury and Crown Estates, which had their own administrative infrastructure; and act as the regional quartermaster-general of the armed forces. In short, as the sole civilian official with superior authority, he had general oversight of the administration, as well as direct control, while not absolute, over governors who were part of the prefecture; the other two fiscal departments were not.

The early-4th-century Verona List, the late-4th-century work of Sextus Rufus, and the early-5th-century List of Offices and work of Polemius Silvius all list four provinces by some variation of the names Britannia I, Britannia II, Maxima Caesariensis, and Flavia Caesariensis; all of these seem to have initially been directed by a governor (praeses) of equestrian rank. The 5th-century sources list a fifth province named Valentia and give its governor and Maxima's a consular rank. Ammianus mentions Valentia as well, describing its creation by Theodosius the Elder in 369 after the quelling of the Great Conspiracy. Ammianus considered it a re-creation of a formerly lost province, leading some to think there had been an earlier fifth province under another name, sometimes conflated with "Vespasiana" a fictional province invented in Charles Bertram's 18th-century forgery De Situ Britanniae and leading others to place Valentia beyond Hadrian's Wall, in the territory abandoned south of the Antonine Wall.

Fourth-century history

Emperor Constantius returned to Britain in 306, despite his poor health, with an army aiming to invade northern Britain, the provincial defences having been rebuilt in the preceding years. Little is known of his campaigns with scant archaeological evidence, but fragmentary historical sources suggest he reached the far north of Britain and won a major battle in early summer before returning south. His son Constantine (later Constantine the Great) spent a year in northern Britain at his father's side, campaigning against the Picts beyond Hadrian's Wall in the summer and autumn. Constantius died in York in July 306 with his son at his side. Constantine then successfully used Britain as the starting point of his march to the imperial throne, unlike the earlier usurper, Albinus.

In the middle of the century, the province was loyal for a few years to the usurper Magnentius, who succeeded Constans following the latter's death. After the defeat and death of Magnentius in the Battle of Mons Seleucus in 353, Constantius II dispatched his chief imperial notary Paulus Catena to Britain to hunt down Magnentius's supporters. The investigation deteriorated into a witch-hunt, which forced the vicarius Flavius Martinus to intervene. When Paulus retaliated by accusing Martinus of treason, the vicarius attacked Paulus with a sword, with the aim of assassinating him, but in the end he committed suicide.

As the 4th century progressed, there were increasing attacks from the Saxons in the east and the Scoti (Irish) in the west. A series of forts had been built, starting around 280, to defend the coasts, but these preparations were not enough when, in 367, a general assault of Saxons, Picts, Scoti and Attacotti, combined with apparent dissension in the garrison on Hadrian's Wall, left Roman Britain prostrate. The invaders overwhelmed the entire western and northern regions of Britannia and the cities were sacked. This crisis, sometimes called the Barbarian Conspiracy or the Great Conspiracy, was settled by Theodosius the Elder from 368 with a string of military and civil reforms. Theodosius crossed from Bononia (Boulogne-sur-Mer) and marched on Londinium where he began to deal with the invaders and made his base. An amnesty was promised to deserters which enabled Theodosius to regarrison abandoned forts. By the end of the year Hadrian's Wall was retaken and order returned. Considerable reorganization was undertaken in Britain, including the creation of a new province named Valentia, probably to better address the state of the far north. A new Dux Britanniarum was appointed, Dulcitius, with Civilis to head a new civilian administration.

End of Roman rule

The traditional view of historians, informed by the work of Michael Rostovtzeff, was of a widespread economic decline at the beginning of the 5th century. Consistent archaeological evidence has told another story, and the accepted view is undergoing re-evaluation. Some features are agreed: more opulent but fewer urban houses, an end to new public building and some abandonment of existing ones, with the exception of defensive structures, and the widespread formation of dark earth (deposits indicating increased horticulture within urban precincts).

The abandonment of some sites is now believed to be later than had been thought. Many buildings changed use but were not destroyed. There was a growing number of barbarian attacks, but these targeted vulnerable rural settlements rather than towns. Some villas such as Chedworth, Great Casterton in Rutland and Hucclecote in Gloucestershire had new mosaic floors laid around this time, suggesting that economic problems may have been limited and patchy. Many suffered some decay before being abandoned in the 5th century; the story of Saint Patrick indicates that villas were still occupied until at least 430. Exceptionally, new buildings were still going up in this period in Verulamium and Cirencester. Some urban centres, for example Canterbury, Cirencester, Wroxeter, Winchester and Gloucester, remained active during the 5th and 6th centuries, surrounded by large farming estates.

Urban life had generally grown less intense by the fourth quarter of the 4th century, and coins minted between 378 and 388 are very rare, indicating a likely combination of economic decline, diminishing numbers of troops, problems with the payment of soldiers and officials or with unstable conditions during the usurpation of Magnus Maximus 383–87. Coinage circulation increased during the 390s, but never attained the levels of earlier decades. Copper coins are very rare after 402, though minted silver and gold coins from hoards indicate they were still present in the province even if they were not being spent. By 407 there were very few new Roman coins going into circulation, and by 430 it is likely that coinage as a medium of exchange had been abandoned. Mass-produced wheel thrown pottery ended at approximately the same time; the rich continued to use metal and glass vessels, while the poor made do with humble "grey ware" or resorted to leather or wooden containers.

Sub-Roman Britain

Towards the end of the 4th century Roman rule in Britain came under increasing pressure from barbarian attacks. Apparently, there were not enough troops to mount an effective defence. After elevating two disappointing usurpers, the army chose a soldier, Constantine III, to become emperor in 407. He crossed to Gaul but was defeated by Honorius; it is unclear how many troops remained or ever returned, or whether a commander-in-chief in Britain was ever reappointed. A Saxon incursion in 408 was apparently repelled by the Britons, and in 409 Zosimus records that the natives expelled the Roman civilian administration. Zosimus may be referring to the Bagaudae rebellion of the Breton inhabitants of Armorica since he describes how, in the aftermath of the revolt, all of Armorica and the rest of Gaul followed the example of the Brettaniai. A letter from Emperor Honorius in 410 has traditionally been seen as rejecting a British appeal for help, but it may have been addressed to Bruttium or Bologna. With the imperial layers of the military and civil government gone, administration and justice fell to municipal authorities, and local warlords gradually emerged all over Britain, still utilizing Romano-British ideals and conventions. Historian Stuart Laycock has investigated this process and emphasised elements of continuity from the British tribes in the pre-Roman and Roman periods, through to the native post-Roman kingdoms.

In British tradition, pagan Saxons were invited by Vortigern to assist in fighting the Picts, Scoti, and Déisi. (Germanic migration into Roman Britannia may have begun much earlier. There is recorded evidence, for example, of Germanic auxiliaries supporting the legions in Britain in the 1st and 2nd centuries.) The new arrivals rebelled, plunging the country into a series of wars that eventually led to the Saxon occupation of Lowland Britain by 600. Around this time, many Britons fled to Brittany (hence its name), Galicia and probably Ireland. A significant date in sub-Roman Britain is the Groans of the Britons, an unanswered appeal to Aetius, leading general of the western Empire, for assistance against Saxon invasion in 446. Another is the Battle of Deorham in 577, after which the significant cities of Bath, Cirencester and Gloucester fell and the Saxons reached the western sea.

Historians generally reject the historicity of King Arthur, who is supposed to have resisted the Anglo-Saxon conquest according to later medieval legends.

Trade

During the Roman period Britain's continental trade was principally directed across the Southern North Sea and Eastern Channel, focusing on the narrow Strait of Dover, with more limited links via the Atlantic seaways. The most important British ports were London and Richborough, whilst the continental ports most heavily engaged in trade with Britain were Boulogne and the sites of Domburg and Colijnsplaat at the mouth of the river Scheldt. During the Late Roman period it is likely that the shore forts played some role in continental trade alongside their defensive functions.

Exports to Britain included: coin; pottery, particularly red-gloss terra sigillata (samian ware) from southern, central and eastern Gaul, as well as various other wares from Gaul and the Rhine provinces; olive oil from southern Spain in amphorae; wine from Gaul in amphorae and barrels; salted fish products from the western Mediterranean and Brittany in barrels and amphorae; preserved olives from southern Spain in amphorae; lava quern-stones from Mayen on the middle Rhine; glass; and some agricultural products. Britain's exports are harder to detect archaeologically, but will have included metals, such as silver and gold and some lead, iron and copper. Other exports probably included agricultural products, oysters and salt, whilst large quantities of coin would have been re-exported back to the continent as well.

These products moved as a result of private trade and also through payments and contracts established by the Roman state to support its military forces and officials on the island, as well as through state taxation and extraction of resources. Up until the mid-3rd century AD, the Roman state's payments appear to have been unbalanced, with far more products sent to Britain, to support its large military force (which had reached c. 53,000 by the mid-2nd century), than were extracted from the island.

It has been argued that Roman Britain's continental trade peaked in the late 1st century AD and thereafter declined as a result of an increasing reliance on local products by the population of Britain, caused by economic development on the island and by the Roman state's desire to save money by shifting away from expensive long-distance imports. Evidence has been outlined that suggests that the principal decline in Roman Britain's continental trade may have occurred in the late 2nd century AD, from c. 165 AD onwards. This has been linked to the economic impact of contemporary empire-wide crises: the Antonine Plague and the Marcomannic Wars.

Economy

Mineral extraction sites such as the Dolaucothi gold mine were probably first worked by the Roman army from c. 75 AD, and at some later stage passed to civilian operators. The mine developed as a series of opencast workings, mainly by the use of hydraulic mining methods. They are described by Pliny the Elder in his Natural History in great detail. Essentially, water supplied by aqueducts was used to prospect for ore veins by stripping away soil to reveal the bedrock. If veins were present, they were attacked using fire-setting and the ore removed for comminution. The dust was washed in a small stream of water and the heavy gold dust and gold nuggets collected in riffles. The diagram at right shows how Dolaucothi developed from c. 75 through to the 1st century. When opencast work was no longer feasible, tunnels were driven to follow the veins. The evidence from the site shows advanced technology probably under the control of army engineers.

The Wealden ironworking zone, the lead and silver mines of the Mendip Hills and the tin mines of Cornwall seem to have been private enterprises leased from the government for a fee. Mining had long been practised in Britain (see Grimes Graves), but the Romans introduced new technical knowledge and large-scale industrial production to revolutionise the industry. It included hydraulic mining to prospect for ore by removing overburden as well as work alluvial deposits. The water needed for such large-scale operations was supplied by one or more aqueducts, those surviving at Dolaucothi being especially impressive. Many prospecting areas were in dangerous, upland country, and, although mineral exploitation was presumably one of the main reasons for the Roman invasion, it had to wait until these areas were subdued.

By the 3rd and 4th centuries, small towns could often be found near villas. In these towns, villa owners and small-scale farmers could obtain specialist tools. Lowland Britain in the 4th century was agriculturally prosperous enough to export grain to the continent. This prosperity lay behind the blossoming of villa building and decoration that occurred between 300 and 350.

Britain's cities also consumed Roman-style pottery and other goods, and were centres through which goods could be distributed elsewhere. During the first two centuries of Roman rule, Britain is said to have been hugely reliant on imported pottery, but by the fourth century, it was self-sufficient. This has been cited as an example of economic development, and at least one town, Durobrivae, primarily manufactured pottery. At Wroxeter in Shropshire, stock smashed into a gutter during a 2nd-century fire reveals that Gaulish samian ware was being sold alongside mixing bowls from the Mancetter-Hartshill industry of the West Midlands. Roman designs were most popular, but rural craftsmen still produced items derived from the Iron Age La Tène artistic traditions. Britain was home to much gold, which attracted Roman invaders. By the 3rd century, Britain's economy was diverse and well established, with commerce extending into the non-Romanised north.

Government

Under the Roman Empire, administration of peaceful provinces was ultimately the remit of the Senate, but those, like Britain, that required permanent garrisons, were placed under the Emperor's control. In practice imperial provinces were run by resident governors who were members of the Senate and had held the consulship. These men were carefully selected, often having strong records of military success and administrative ability. In Britain, a governor's role was primarily military, but numerous other tasks were also his responsibility, such as maintaining diplomatic relations with local client kings, building roads, ensuring the public courier system functioned, supervising the civitates and acting as a judge in important legal cases. When not campaigning, he would travel the province hearing complaints and recruiting new troops.

To assist him in legal matters he had an adviser, the legatus juridicus, and those in Britain appear to have been distinguished lawyers perhaps because of the challenge of incorporating tribes into the imperial system and devising a workable method of taxing them. Financial administration was dealt with by a procurator with junior posts for each tax-raising power. Each legion in Britain had a commander who answered to the governor and, in time of war, probably directly ruled troublesome districts. Each of these commands carried a tour of duty of two to three years in different provinces. Below these posts was a network of administrative managers covering intelligence gathering, sending reports to Rome, organising military supplies and dealing with prisoners. A staff of seconded soldiers provided clerical services.

Colchester was probably the earliest capital of Roman Britain, but it was soon eclipsed by London with its strong mercantile connections. The different forms of municipal organisation in Britannia were known as civitas (which were subdivided, amongst other forms, into colonies such as York, Colchester, Gloucester and Lincoln and municipalities such as Verulamium), and were each governed by a senate of local landowners, whether Brythonic or Roman, who elected magistrates concerning judicial and civic affairs. The various civitates sent representatives to a yearly provincial council in order to profess loyalty to the Roman state, to send direct petitions to the Emperor in times of extraordinary need, and to worship the imperial cult.

Demographics

Roman Britain had an estimated population between 2.8 million and 3 million people at the end of the second century. At the end of the fourth century, it had an estimated population of 3.6 million people, of whom 125,000 consisted of the Roman army and their families and dependents. The urban population of Roman Britain was about 240,000 people at the end of the fourth century. The capital city of Londinium is estimated to have had a population of about 60,000 people.

Londinium was an ethnically diverse city with inhabitants from the Roman Empire, including natives of Britannia, continental Europe, the Middle East, and North Africa. There was also cultural diversity in other Roman-British towns, which were sustained by considerable migration, from Britannia and other Roman territories, including continental Europe, Roman Syria, the Eastern Mediterranean and North Africa. In a 2012 study, around 45 percent of sites investigated dating from the Roman period had at least one individual of North African origin.

Town and country

During their occupation of Britain, the Romans founded a number of important settlements, many of which survive. The towns suffered attrition in the later 4th century, when public building ceased and some were abandoned to private use. Place names survived the deurbanised Sub-Roman and early Anglo-Saxon periods, and historiography has been at pains to signal the expected survivals, but archaeology shows that a bare handful of Roman towns were continuously occupied. According to S.T. Loseby, the very idea of a town as a centre of power and administration was reintroduced to England by the Roman Christianising mission to Canterbury, and its urban revival was delayed to the 10th century.

Roman towns can be broadly grouped in two categories. Civitates, "public towns" were formally laid out on a grid plan, and their role in imperial administration occasioned the construction of public buildings. The much more numerous category of vici, "small towns" grew on informal plans, often round a camp or at a ford or crossroads; some were not small, others were scarcely urban, some not even defended by a wall, the characteristic feature of a place of any importance.

Cities and towns which have Roman origins, or were extensively developed by them are listed with their Latin names in brackets; civitates are marked C.

Religion

Pagan

The druids, the Celtic priestly caste who were believed to originate in Britain, were outlawed by Claudius, and in 61 AD they vainly defended their sacred groves from destruction by the Romans on the island of Mona (Anglesey). Under Roman rule the Britons continued to worship native Celtic deities, such as Ancasta, but often conflated with their Roman equivalents, like Mars Rigonemetos at Nettleham.

The degree to which earlier native beliefs survived is difficult to gauge precisely. Certain European ritual traits such as the significance of the number 3, the importance of the head and of water sources such as springs remain in the archaeological record, but the differences in the votive offerings made at the baths at Bath, Somerset, before and after the Roman conquest suggest that continuity was only partial. Worship of the Roman emperor is widely recorded, especially at military sites. The founding of a Roman temple to Claudius at Camulodunum was one of the impositions that led to the revolt of Boudica. By the 3rd century, Pagans Hill Roman Temple in Somerset was able to exist peaceably and it did so into the 5th century.

Pagan religious practices were supported by priests, represented in Britain by votive deposits of priestly regalia such as chain crowns from West Stow and Willingham Fen.

Eastern cults such as Mithraism grew in popularity towards the end of the occupation. The London Mithraeum is one example of the popularity of mystery religions among the soldiery. Temples to Mithras also exist in military contexts at Vindobala on Hadrian's Wall (the Rudchester Mithraeum) and at Segontium in Roman Wales (the Caernarfon Mithraeum).

Christianity

It is not clear when or how Christianity came to Britain. A 2nd-century "word square" has been discovered in Mamucium, the Roman settlement of Manchester. It consists of an anagram of PATER NOSTER carved on a piece of amphora. There has been discussion by academics whether the "word square" is a Christian artefact, but if it is, it is one of the earliest examples of early Christianity in Britain. The earliest confirmed written evidence for Christianity in Britain is a statement by Tertullian, c. 200 AD, in which he described "all the limits of the Spains, and the diverse nations of the Gauls, and the haunts of the Britons, inaccessible to the Romans, but subjugated to Christ".

Archaeological evidence for Christian communities begins to appear in the 3rd and 4th centuries. Small timber churches are suggested at Lincoln and Silchester and baptismal fonts have been found at Icklingham and the Saxon Shore Fort at Richborough. The Icklingham font is made of lead, and visible in the British Museum. A Roman Christian graveyard exists at the same site in Icklingham. A possible Roman 4th-century church and associated burial ground was also discovered at Butt Road on the south-west outskirts of Colchester during the construction of the new police station there, overlying an earlier pagan cemetery.

The Water Newton Treasure is a hoard of Christian silver church plate from the early 4th century and the Roman villas at Lullingstone and Hinton St Mary contained Christian wall paintings and mosaics respectively. A large 4th-century cemetery at Poundbury with its east–west oriented burials and lack of grave goods has been interpreted as an early Christian burial ground, although such burial rites were also becoming increasingly common in pagan contexts during the period.

The Church in Britain seems to have developed the customary diocesan system, as evidenced from the records of the Council of Arles in Gaul in 314: represented at the council were bishops from thirty-five sees from Europe and North Africa, including three bishops from Britain, Eborius of York, Restitutus of London, and Adelphius, possibly a bishop of Lincoln. No other early sees are documented, and the material remains of early church structures are far to seek.

The existence of a church in the forum courtyard of Lincoln and the martyrium of Saint Alban on the outskirts of Roman Verulamium are exceptional. Alban, the first British Christian martyr and by far the most prominent, is believed to have died in the early 4th century (some date him in the middle 3rd century), followed by Saints Julius and Aaron of Isca Augusta. Christianity was legalised in the Roman Empire by Constantine I in 313. Theodosius I made Christianity the state religion of the empire in 391, and by the 5th century it was well established. One belief labelled a heresy by the church authorities – Pelagianism – was originated by a British monk teaching in Rome: Pelagius lived c. 354 to c. 420/440.

Environmental changes

The Romans introduced a number of species to Britain, including possibly the now-rare Roman nettle (Urtica pilulifera), said to have been used by soldiers to warm their arms and legs, and the edible snail Helix pomatia. There is some evidence they may have introduced rabbits, of the smaller southern Mediterranean type. The European rabbit (Oryctolagus cuniculus) prevalent in modern Britain is assumed to have been introduced from the continent after the Norman invasion of 1066. Box (Buxus sempervirens) is rarely recorded before the Roman period, but becomes a common find in towns and villas.

Legacy

During their occupation of Britain the Romans built an extensive network of roads which continued to be used in later centuries and many are still followed today. The Romans also built water supply, sanitation and wastewater systems. Many of Britain's major cities, such as London (Londinium), Manchester (Mamucium) and York (Eboracum), were founded by the Romans, but the original Roman settlements were abandoned not long after the Romans left.

Unlike many other areas of the Western Roman Empire, the current majority language is not a Romance language, or a language descended from the pre-Roman inhabitants. The British language at the time of the invasion was Common Brittonic, and remained so after the Romans withdrew. It later split into regional languages, notably Cumbric, Cornish, Breton and Welsh. Examination of these languages suggests some 800 Latin words were incorporated into Common Brittonic (see Brittonic languages). The current majority language, English, is based on the languages of the Germanic tribes who migrated to the island from continental Europe from the 5th century onwards.