End of Roman Britain (c. 410): Rome Leaves the Province

The end of Roman Britain came around AD 410, when the province of Britannia ceased to be governed by the Roman Empire after nearly 370 years. Years of usurpations, troop withdrawals and invasions on the continent left the island without a Roman army or administration, and the Britons were told, or decided, to defend themselves. Within a few generations Roman town life had faded and Anglo-Saxon settlers were reshaping lowland Britain.

Background: four centuries of Roman rule

Rome invaded Britain in AD 43 under the emperor Claudius (see Roman conquest of Britain). Over the next decades the province expanded to cover most of what is now England and Wales, with a northern frontier eventually fixed on Hadrian’s Wall.

By the 4th century Britain was a prosperous part of the empire. It had walled towns, large country villas with mosaics, a road network, a money economy and a Christian church. Its garrison, perhaps 30,000 or more soldiers at its height and fewer later, was a major part of the economy.

The province also had a habit of producing usurpers. Carausius and Allectus ruled an independent “British empire” from 286 to 296, and in 306 Constantine the Great was proclaimed emperor at York.

Troops leave, one usurper at a time

The army in Britain shrank in stages:

• 383: The general Magnus Maximus was proclaimed emperor in Britain and took troops to Gaul. He ruled the West until he was defeated by Theodosius I in 388. Many of his soldiers probably never returned.
• c. 401–402: The poet Claudian suggests that Stilicho, the Western commander, withdrew a legion from Britain to defend Italy against Alaric’s Goths.
• 406–407: The army in Britain proclaimed three emperors in quick succession: Marcus, then Gratian, and finally a soldier named Constantine, known as Constantine III.

Constantine III crossed to Gaul in 407 with the best of the remaining field troops, aiming to defend the Rhine after Vandals, Alans and Suebi had crossed it at the end of 406. For a time he controlled Gaul and Spain and was even recognised by Honorius as co-emperor in 409.

The Britons break away

According to the Greek historian Zosimus, writing about a century later but using a well-informed earlier source, Britain was attacked by Saxon raiders in 408 or 409. With Constantine III busy on the continent, the Britons took up arms, freed their cities from the barbarians, expelled Constantine’s officials and set up their own government.

This was not a rebellion against Rome as such but a rejection of an absent usurper who could not protect them. It meant, however, that no official Roman authority remained in Britain.

The Rescript of Honorius

Zosimus also reports that in 410 Honorius sent letters to the cities of Britain urging them to guard themselves. This passage, known as the Rescript of Honorius, has traditionally been read as Rome formally telling the Britons that they were on their own.

Some historians question this reading. The passage appears in the middle of an account of events in Italy, and Zosimus’s word “Brettia” could be a copying or author’s error for Bruttium, the toe of Italy. Others defend the traditional view. Either way, by 410 the Western government, its capital Rome itself under siege by Alaric (see Sack of Rome), had neither the men nor the money to restore control.

What the archaeology shows

Archaeology tells a clearer story than the texts. New Roman coins largely stopped arriving in Britain after about 402, and the province’s coin-based economy broke down within a few decades. Mass-produced pottery industries closed, villas were abandoned or reused, and many towns shrank to small communities within their old walls.

Wealthy families buried their valuables, never to recover them. The Hoxne Hoard, found in Suffolk in 1992, contained more than 15,000 gold, silver and bronze coins together with jewellery and silver tableware. Its latest coins date to the reign of Honorius, so it was hidden sometime after about 407.

The changes were not identical everywhere. In the west and north, in places such as Wroxeter and Birdoswald on Hadrian’s Wall, there is evidence of continued occupation and even new timber buildings in the 5th century.

Sub-Roman Britain

The period after 410 is often called “sub-Roman” or post-Roman Britain. Written evidence is scarce. The monk Gildas, writing in the 6th century, describes British rulers appealing to the Roman general Aetius, “thrice consul”, for help against invaders, which would date the appeal to 446 or later. No help came.

Christianity survived. In 429 Bishop Germanus of Auxerre visited Britain to combat the teachings of Pelagius, a British-born theologian, and according to his biographer debated with local leaders and helped Britons win a victory over raiders. The missionary Patrick, a Romano-Briton born in the late 4th or 5th century, later spread Christianity in Ireland.

Meanwhile Angles, Saxons and Jutes from across the North Sea settled in growing numbers. A Gaulish chronicle written in 452 claims that Britain passed into the power of the Saxons around 441, while later English tradition, preserved by Bede and the Anglo-Saxon Chronicle, placed the arrival of Hengist and Horsa in 449. Whether settlement came through invasion, invitation as mercenaries or gradual migration is still debated.

Debates among historians

Historians disagree about how sudden the end was. Some, stressing the archaeology, describe a rapid economic collapse in the first half of the 5th century, as the end of army pay and imperial taxation removed the structures that had held the Roman economy together.

Others emphasise continuity: Latin inscriptions in western Britain, Christian communities, British kingdoms that grew out of Roman districts, and the survival of town sites such as London, York and Canterbury, which later revived. Many now see a mixture of both, with sharp decline in the east and south and greater continuity in the west.

Myths and facts

Myth: the Romans “left” in a single evacuation in 410. There was no organised departure. Troops drained away over decades, and many soldiers and officials were locals who stayed.

Myth: Britain was suddenly plunged into darkness. Decline was rapid in material terms, but Roman ways, Latin and Christianity lingered, especially in the west, for generations.

Fact: King Arthur cannot be placed securely in this period. Legends set Arthur in the decades after Roman rule, but no contemporary source mentions him and historians do not agree that he existed.

Key people

• Magnus Maximus (died 388): usurper who took troops from Britain to Gaul in 383.
• Stilicho (c. 359–408): Western commander who may have withdrawn troops around 401.
• Constantine III (died 411): usurper proclaimed in Britain in 407.
• Honorius (384–423): Western emperor in 410.
• Germanus of Auxerre (c. 378–448): Gallic bishop who visited Britain in 429.

Timeline

• 43: Roman invasion of Britain under Claudius.
• 383: Magnus Maximus takes troops to the continent.
• c. 401–402: Possible withdrawal of a legion by Stilicho.
• c. 402: Regular supply of new coin to Britain largely ends.
• 406, 31 December: Vandals, Alans and Suebi cross the Rhine (traditional date).
• 407: Constantine III is proclaimed in Britain and crosses to Gaul.
• 409: Britons expel Constantine’s officials, according to Zosimus.
• 410: The Rescript of Honorius; Alaric sacks Rome.
• 429: Germanus of Auxerre visits Britain.
• c. 441–449: Saxon settlement becomes significant, according to later sources.

Why it matters

The end of Roman Britain marks one of the sharpest breaks in British history. It ended the island’s place in a Mediterranean empire, opened the way for the Anglo-Saxon kingdoms that became England, and left Roman roads, town sites and Christianity as lasting foundations.