3rd century in Roman Britain

Events from the 3rd century in Roman Britain.

Events

 * 206
 * Governor Lucius Alfenus Senecio repairs Hadrian's Wall and appeals for help from the Emperor against the northern tribes.
 * 208
 * Emperor Septimius Severus and his son Caracalla take personal command of the army in Britain.
 * 209
 * Severus and Caracalla lead an expedition against the Caledonii, and build forts at Cramond and the Tay estuary.
 * 210
 * Caracalla leads an expedition against the rebellious Maeatae tribe.
 * 211
 * 4 February – Severus dies at York, while preparing another expedition against the northern rebels.
 * Caracalla, now Emperor, abandons territory north of Hadrian's Wall, and returns to Rome.
 * c. 214
 * Britain divided into two provinces, Britannia Superior and Britannia Inferior, with administrative centres at London and York respectively.
 * c. 220
 * Saxons raid south-east coast; forts built at Reculver and Branodunum (Brancaster).
 * 245
 * Many thousands of acres of modern-day Lincolnshire are inundated by a great flood.
 * 255
 * Work begins on a riverside wall in London.
 * 259
 * Rebel leader Latinus Postumus proclaims Britain as part of his "Empire of the Gauls".
 * 270
 * Construction of forts along the Saxon Shore begins in response to increased raiding.
 * 273
 * Stone walls built around St Albans.
 * 274
 * Postumus's Gallic Empire is reabsorbed into the Roman Empire under Aurelian.
 * 277
 * Imperial edict lifts restrictions on British wine production.
 * General Victorinus puts down revolt, and settles Burgundian and Vandal prisoners in Britain.
 * Britannic Empire 286-296
 * 287
 * Mausaeus Carausius takes power in Britain and proclaims himself Emperor.
 * 289
 * Carausius defeats Emperor Maximian in a naval battle.
 * 293
 * Finance minister Allectus murders Carausius and seizes power; employs Frankish mercenaries.
 * 296
 * Julius Constantius defeats Britons near Silchester, killing Allectus; prevents retreating Franks from sacking London.
 * 297
 * Re-building of forts near Hadrian's Wall begins.
 * Constantius returns to Gaul.