1740s forgery The Description of Britain, which gave Prima borders south of the Thames and the Bristol Channel; his work was, however, debunked over the course of the mid-19th century. Owing to an inscription discovered at Corinium of the Dobunni (Cirencester) which refers to a rector of Britannia Prima named Lucius Septimius, Corinium is generally accounted as the provincial capital. The list of bishops who attended the 314 Council of Arles is patently corrupt but generally assumed to have mimicked the Roman administration: Camden proposed that Prima was based at London and Secunda at Caerleon and these were the two bishops apart from York. Bishop Stillingfleet and Thackery further proposed that scribal error had produced the bishop de colonia Londinensium ("from London colony") from original notes understood as Civ. Col. Londin. when Civ. Col. Leg. II (Caerleon) was intended. (Others place the bishop variously in Lincoln, Chester, and Colchester.) Legions The Second Augustan and Twentieth Valerian legions may have still been based at Isca Augusta (Caerleon) and Deva Victrix (Chester), although this is unclear. Valentia Ammianus records that in the year 369 Count Theodosius established or refounded the province of Valentia (further attested in the List of Offices) from lands recaptured from "the enemy". Its location is a matter of scholarly debate, but some place it in northwestern Wales with its capital at Deva (Chester). If so, it was probably intended to counter the extensive Irish piracy and raiding occurring in late antiquity. Notes References 410 disestablishments Late Roman provinces States and territories established in the 3rd century States and territories established in the 4th century Roman Britain