Britannia Secunda
Britannia Secunda or Britannia II was one of the provinces of the Diocese of "the Britains" created during the Diocletian Reforms at the end of the 3rd century. It was probably created after the defeat of the usurper Allectus by Constantius Chlorus in AD 296 and was mentioned in the Verona List of the Roman provinces. Its position and capital remain uncertain, although it probably lay further from Rome than Britannia I. At present, most scholars place Britannia II in Yorkshire and northern England. If so, its capital would have been Eboracum.
File:Roman Britain 410.jpg|left|200px|thumb|The traditional arrangement of the late Roman provinces after Camden, placing Secunda in Wales. On the basis of modern archaeology, Prima at least reached as far north as Corinium.
History
Following the Roman conquest of Britain, it was administered as a single province from Camulodunum and then Londinium until the Severan Reforms following the revolt of its governor Clodius Albinus. These divided the territory into Britannia Superior and Britannia Inferior, whose respective capitals were at Londinium and Eboracum. During the first phases of the Diocletian Reforms, Britain was under the control of the Allectus's Britannic Empire as part of the Carausian Revolt. At some point after the territory was retaken by Constantius Chlorus in AD 296, the Diocese of the Britains was formed and made a part of Prefecture of Gaul. The Britains were divided among three, four, or five provinces, which seem to have borne the names Prima, Secunda, Maxima Caesariensis, and Flavia Caesariensis and Valentia.The placement and capitals of these late British provinces are uncertain, although the Notitia Dignitatum lists the governor of Britannia II as being equestrian rank, making it unlikely to have been based in Londinium. The list of bishops who attended the 314 Council of Arles is patently corrupt but generally assumed to have mimicked the Roman administration: it seems certain one of the bishops was from Eboracum, even if his name was a scribal error.