established by SS Fagan and "Duvian", Gerald of Wales placed Flavia around London, extending into Mercia. Bertram's highly-influential forgery The Description of Britain placed it similarly: although not including London, it included central England and was bound by the Severn, the Thames, the North Sea, and the Humber and Mersey; this was accepted for a century from the 1740s to the 1840s before being revealed as a forgery. Modern scholars usually place Londinium in Maxima rather than Flavia. Birley has argued that Maxima and Flavia originally consisted of a single province, which received the name Britannia Caesariensis as a mark of favour for support against the rebel Allectus in 296. Although Flavia is usually thought to have been formed from the old province of Lower Britain, Birley proposes that Upper Britain was divided in two (between Prima and Caesariensis) and then three (Prima, Maxima, and Flavia). This repeats Camden's earlier theory (relying on Sextus Rufus) that Maxima was formed first and Flavia followed sometime after. Supporters of a later creation of Flavia note that it need not refer to Constantius Chlorus himself: instead, it may have honored any of Constantine, Valentinian, or Theodosius. References Late Roman provinces Roman Britain States and territories established in the 3rd century States and territories established in the 4th century 410 disestablishments