Romano-British culture describes the culture that arose in Britain under the Roman Empire following the Roman conquest in AD 43 and the creation of the province of Britannia. It arose as a fusion of the imported Roman culture with that of the indigenous Britons, a people of Celtic language and custom. It survived the 5th century Roman departure from Britain. Scholars such as Christopher Snyder believe that during the 5th and 6th centuries — approximately from AD 410 when the Roman legions withdrew, to AD 597 when St Augustine of Canterbury arrived — southern Britain preserved an active sub-Roman culture that survived the attacks from the Anglo-Saxons and even used a vernacular Latin when writing.
Arrival of the Romans 
Roman troops, mainly from nearby Germanic provinces, invaded what is now England in AD 43 in the reign of Emperor Claudius. Over the next few years the province of Britannia was formed, eventually including the whole of England and Wales and parts of Scotland. Thousands of Roman businessmen and officials and their families settled in Britannia. Roman troops from across the Empire as far as Spain, Syria, and Egypt, but mainly from the Germanic provinces of Batavia and Frisia (modern Netherlands, Belgium, and the Rhineland area of Germany) were garrisoned in Roman towns, and many intermarried with local Britons. This diversified Britannia's cultures and religions, while the populace remained mainly Celtic with a Roman way of life.
Christianity came to Britain in the 3rd century. One early figure was Saint Alban, who was martyred near the Roman town of Verulamium, on the site of the modern St Albans, by tradition during the reign of Emperor Decius.
Roman citizenship 
One aspect of Roman influence seen in British life was the grant of Roman citizenship. At first this was granted very selectively: to the council members of certain classes of towns, whom Roman practice made citizens; to veterans, either legionaries or soldiers in auxiliary units; and to a number of natives whose patrons obtained citizenship for them. Some of the local Brittonic kings, such as Togidubnus, received citizenship in this manner. The number of citizens steadily increased, as people inherited citizenship and more grants were made. Eventually in 212, everybody except slaves and freed slaves was granted citizenship by the Constitutio Antoniniana.
The other inhabitants of Britain, who did not enjoy citizenship, the Peregrini, continued to live under the laws of their ancestors. The principal handicaps were that they could not own land with a Latin title, serve as a legionary in the army (although they could serve in an auxiliary unit, and become a Roman citizen upon discharge), or, in general, inherit from a Roman citizen. But for the majority of British inhabitants, who were peasants tied to the soil, citizenship would not dramatically alter their daily lives.
Roman departure from Britain 
Britannia became one of the most loyal provinces of the Empire until its decline, when Britannia's manpower was diverted by civil wars. Eventually Emperor Honorius ordered Roman troops back home to help fight the invading hordes. Constantine III initially rebelled against Honorius and took further troops to Gaul, but was later recognised as a joint emperor.
After the Roman departure from Britain, the Romano-British were commanded by Honorius to "look to their own defences". A written plea to General Flavius Aëtius, known as the Groans of the Britons, may have brought some brief naval assistance from the fading Roman Empire of the West, but otherwise they were on their own.
Post-Roman period 
In the early stages the lowlands and cities may have had some organisation or "council" and the Bishop of London appears to have played a key role, but they were divided politically as former soldiers, mercenaries, nobles, officials and farmers declared themselves kings, fighting amongst each other and leaving Britain open to invasion. Two factions may have emerged: a pro-Roman faction and an independence faction. The one leader at this time known by name is Vortigern, who may have held the title of "High King". The depredations of the Picts from the north and Scotti (Scots) from Ireland forced the Britons to seek help from pagan Germanic tribes of Angles, Saxons and Jutes, who then decided to settle in Britain. Some of the Romano-British people migrated to Brittany, Galicia, and possibly Ireland.
The Anglo-Saxons obtained control of eastern England in the 5th century. In the mid-6th century they started expanding into the Midlands, then in the 7th century they expanded again into the south-west and the north of England. The unconquered parts of southern Britain, notably Wales, retained their Romano-British culture, in particular retaining Christianity.
Some Anglo-Saxon histories (in context) refer to the Romano-British people by the blanket term "Welsh". The term Welsh is an Old English word meaning 'foreigner', referring to the old inhabitants of southern Britain. Historically, Wales and the south-western peninsula were known respectively as North Wales and West Wales. The Celtic north of England and southern Scotland was referred to as Hen Ogledd ("old north").
The struggles of this period have given rise to the legends of Uther Pendragon and King Arthur. There are many theories, but it is sometimes said that Ambrosius Aurelianus, the leader of the Romano-British forces, was the model for the former, and that Arthur's court of Camelot is an idealised Welsh and Cornish memory of pre-Saxon Romano-British civilisation.
See also 
- British Romance
- Roman sites in the United Kingdom
- Gallo-Roman culture
- Sub-Roman Britain
- Kinder, H. & Hilgemann W. The Penguin Atlas of World History, Penguin Books, London 1978, ISBN 0-14-051054-0
- Early British Settlements in Galicia
- Jones, Michael (1996) The End of Roman Britain. Ithaca: Cornell University Press
- Myres, John (1960) Pelagius and the End of Roman Rule in Britain. In: Journal of Roman Studies, 50, 21-36.
- Pryor, Francis (2004) Britain AD: a Quest for Arthur, England and the Anglo-Saxons. London: Harper Collins ISBN 0-00-718186-8
- Radford, C. A. Ralegh (1939) Tintagel Castle. London: H.M.S.O. (Reprinted by English Heritage 1985)
- Thomas, Charles (1993) Tintagel: Arthur and Archaeology. London: English Heritage