During the reign of Commodus, the defences along the northern border of the empire in Britannia fell into neglect and disrepair. The peace of the region was further disturbed in the tumultuous period after Commodus' death as the military power vacuum on the continent distracted the defensive legions stationed in Britannia.[3] After his accession in 193, Severus took special interest in refortifying the northern border in Britannia, and in 208 he moved to Eboracum to oversee the military campaigns against the northern tribes. While there is some confusion as to the exact date when the subdivision of Britannia was made, it seems clear that Severus's intentions were to break up the size of the military under the command of an individual governor (as he had done in Syria), preventing them from wielding too large a military force, or at least one that could destabilize the emperor's control.
An African inscription dated to the reign of Caracalla provides a potential early confirmation of the division occurring under Severus.[4] Herodian puts the date of the split in 197,[5] although there is no evidence of this distinction being formalised in inscriptions until after the death of Severus in 211. Thus, it is likely that the division of military control in Britannia was formally established by Caracalla sometime between 211 and 20.[5] Caracalla also moved the southern border of the province northwards from the line established by Severus, transferring northern modern Wales and the region surrounding Chester to Britannia Superior.[6]
In the reign of Severus, the province's fortifications were significantly improved in order to provide better defence against northern tribes.[7] A major rebuilding of Hadrian's Wall was included among these efforts.[1] The province hosted a single legion during Caracalla's reign, the VI Victrix, which was stationed at Eboracum.[8] However, although Britannia Inferior had only the single legion (compared to the two stationed in Britannia Superior) the northern province actually had more soldiers than the south did, as a result of the large number of auxiliaries in the north.[9] After the successes of Severus against the northern tribes, these troops furnished small units known as exploratores which were sent beyond the frontier to oversee native activities and ensure that the terms of Roman treaties with these groups were upheld.[10] These measures were mostly effective and during Britannia Inferior's existence the northern border was largely peaceful after the campaign of Severus.[11]
From 260 to 273 AD Britannia Inferior, along with much of the rest of the western Empire, broke away from the rest of the Roman Empire to form the Gallic Empire.[12] The second half of the province's history also coincided with a period of poor economic conditions across Roman Britain.[12]
The symbol of the province, attested by several lead sealings, was a bull.[13]
- Britannia Superior ("Upper Britain")
- Roman Britain, the Roman controlled area in Britain of which Britannia Inferior and Superior were the two primary subdivisions
The Cambridge Ancient History, Volume XII, London: Cambridge University Press, 1970: p.706
Sheppard Frere, Britannia: a history of Roman Britain, Cambridge: Harvard University Press, 1967, p. 169 Atkinson, Donald (1922). "The Governors of Britain from Claudius to Diocletian". The Journal of Roman Studies. 12: 68. doi:10.2307/296172. JSTOR 296172. The Cambridge Ancient History, Volume XII, p. 8
Mann, J.C. (1997). "The Division of Britain in AD 197". Zeitschrift für Papyrologie und Epigraphik. 119: 253–254 – via JSTOR.
Mann, J.C.; Jarrett, M.G. (1967). "The Division of Britain". The Journal of Roman Studies. 57 (1/2): 64.
Sawyer, P.H. (1978). From Roman Britain to Normal England. Abingdon: Routledge. p. 58. ISBN 0-415-17894-0. Hanson, W.S (2004). "Scotland and the Northern Frontier: Second to Fourth Centuries AD". In Todd, Malcolm (ed.). A Companion to Roman Britain. Malden: Blackwell. p. 139. ISBN 978-0-631-21823-4. Woods, David (2000). "Julian, Gallienus, and the Solar Bull". American Journal of Numismatics. 12: 162.
"124: The Provincial Reorganisation", Roman Civilization Volume II: Selected Readings, The Empire, ed. Naphtali Lewis and Meyer Reinhold, 3rd ed. New York: Columbia University Press, 1990, pp. 427-428.