The army which guarded or coerced the province consisted, from the time of Hadrian onwards, of (I) three legions, the Second at Isca Silurum (Caerleon-on-Usk, q.v.), the Ninth at Eburacum (q.v.; now York), the Twentieth at Deva (q.v.; now Chester), a total of some 15,000 heavy infantry; and (2) a large but uncertain number of auxiliaries, troops of the second grade, organized in infantry cohorts or cavalry alae, each 500 or 1000 strong, and posted in castella nearer the frontiers than the legions.
North-west of York and the most northerly Romano-British town; Ratae, now Leicester, capital of the Coritani; Viroconium, now Wroxeter, near Shrewsbury, capital of the Cornovii; Venta Silurum, now Caerwent, near Chepstow; Corinium, now Cirencester, capital of the Dobuni; Isca Dumnoniorum, now Exeter, the most westerly of these towns; Durnovaria, now Dorchester, in Dorset, capital of the Durotriges; Venta Belgarum, now Winchester; Calleva Atrebatum, now Silchester, 10 m.
48, but a legionary fortress (Isca Silurum, Caerleon) was planted in their midst and by A.D.
Their town Venta Silurum (Cwrwent, 6 m.
From Deva (Chester) by way of Uriconium (Wroxeter) and Gobannium (Abergavenny) to Isca Silurum (Caerleon-on-Usk) and Venta Silurum (Caerwent); another from Deva to Conovium (Conway), whence a road, the Sam Helen, extended due S.